Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Braves Holdings Notes (Details)

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Long-Term Debt - Braves Holdings Notes (Details)
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1 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
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Aug. 31, 2016
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Dec. 31, 2015
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Sep. 30, 2015
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Sep. 30, 2017
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Sep. 30, 2016
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Dec. 31, 2014
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Dec. 31, 2016
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Aug. 31, 2015
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Debt Instrument [Line Items]                  
Outstanding principal         $ 13,243,000,000        
Long-term Debt         13,492,000,000     $ 8,018,000,000  
Borrowings of debt         5,820,000,000 $ 2,019,000,000      
Braves Holdings Mixed Use Facility Credit Facilities Total                  
Debt Instrument [Line Items]                  
Outstanding principal         $ 152,000,000        
Effective interest rate         3.47%        
Braves Holdings Entertainment Credit Facility                  
Debt Instrument [Line Items]                  
Outstanding principal         $ 24,000,000        
Effective interest rate         4.23%        
Braves Holdings                  
Debt Instrument [Line Items]                  
Area of land acquired (in acres) | a             82    
Braves Holdings | Braves Holdings Term Loan                  
Debt Instrument [Line Items]                  
Debt issuance amount $ 55,000,000 $ 130,000,000              
Debt Instrument, Description of Variable Rate Basis       LIBOR          
Effective interest rate         2.99%        
Braves Holdings | Braves Holdings Floating Rate Notes                  
Debt Instrument [Line Items]                  
Debt issuance amount $ 75,000,000                
Debt Instrument, Basis Spread on Variable Rate 1.70%                
Braves Holdings | Braves Holdings Revolving Credit Facilities Total                  
Debt Instrument [Line Items]                  
Effective interest rate         2.46%        
Braves Holdings | Braves Holdings Entertainment Credit Facility                  
Debt Instrument [Line Items]                  
Debt Instrument, Description of Variable Rate Basis   LIBOR              
Debt Instrument, Basis Spread on Variable Rate   3.25%              
Line of Credit Facility, Maximum Borrowing Capacity   $ 30,000,000              
Extension Options on Credit Facilities | item   1              
Extension option duration   12 months              
Braves Holdings | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         $ 185,000,000        
Braves Holdings | Revolving Credit Facility | Braves Holdings Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, unused borrowing capacity, fee, percent       0.35%          
Braves Holdings | Revolving Credit Facility | Braves Holdings Revolving Credit Facility One                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         85,000,000       $ 250,000,000
Braves Holdings | Term Loan | Braves Holdings Term Loan                  
Debt Instrument [Line Items]                  
Debt issuance amount       $ 345,000,000          
Braves Holdings | Senior Notes | Braves Holdings Senior Secured Notes                  
Debt Instrument [Line Items]                  
Debt issuance amount   $ 200,000,000              
Debt Instrument, Interest Rate, Stated Percentage   3.77%              
Braves Holdings | Cobb County Major League Baseball Ballpark                  
Debt Instrument [Line Items]                  
Expected cost of new facility         672,000,000        
Construction and Development Costs         $ 718,000,000        
Lease term         30 years        
Property, Plant and Equipment, Useful Life         45 years        
Braves Holdings | Cobb County Major League Baseball Ballpark | Revolving Credit Facility | Braves Holdings Term Loan and Revolving Credit Facilities                  
Debt Instrument [Line Items]                  
Long-term Debt         $ 209,000,000        
Braves Holdings | Cobb County Ballpark Mixed Use Development                  
Debt Instrument [Line Items]                  
Expected cost of new facility         558,000,000        
Construction and Development Costs         398,000,000        
Proceeds from equity issuance to fund new facility         200,000,000        
Proceeds from debt issuance to fund new facility         $ 270,000,000        
Braves Holdings | Cobb County Ballpark Mixed Use Development | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt Instrument, Description of Variable Rate Basis         LIBOR        
Number of credit facilities | item     3            
Line of Credit Facility, Maximum Borrowing Capacity     $ 207,000,000            
Extension Options on Credit Facilities | item         2        
Shares pledged as collateral under loan | shares         464        
Share value         $ 48,000,000        
Braves Holdings | Other Costs And Equipment                  
Debt Instrument [Line Items]                  
Construction and Development Costs         50,000,000        
Braves Holdings | Cobb Marietta Coliseum And Exhibit Hall Authority [Member] | Cobb County Major League Baseball Ballpark                  
Debt Instrument [Line Items]                  
Due from Affiliates         392,000,000        
Fair Value of Assets Acquired         390,000,000        
Braves Holdings | Affiliated Entities | Cobb County Ballpark Mixed Use Development                  
Debt Instrument [Line Items]                  
Construction and Development Costs         $ 470,000,000        
Minimum | Braves Holdings | Braves Holdings Term Loan                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 1.375%     1.50%          
Minimum | Braves Holdings | Cobb County Ballpark Mixed Use Development | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate         2.00%        
Maximum | Braves Holdings | Braves Holdings Term Loan                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate 1.625%     1.75%          
Maximum | Braves Holdings | Cobb County Ballpark Mixed Use Development | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate         2.60%