Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets (Amortizable Intangibles) (Details)

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Goodwill and Other Intangible Assets (Amortizable Intangibles) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 7,442 $ 1,832  
Accumulated amortization (1,311) (760)  
Finite-Lived Intangible Assets, Net, Total 6,131 1,072  
Amortization of Intangible Assets 594 168 $ 155
2018 611    
2019 598    
2020 502    
2021 469    
2022 433    
FIA Agreement      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 3,630    
Accumulated amortization (157)    
Finite-Lived Intangible Assets, Net, Total 3,473    
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 2,684 830  
Accumulated amortization (501) (228)  
Finite-Lived Intangible Assets, Net, Total $ 2,183 602  
Customer Relationships | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Customer Relationships | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 15 years    
Licensing Agreements      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 330 316  
Accumulated amortization (138) (109)  
Finite-Lived Intangible Assets, Net, Total $ 192 207  
Finite-Lived Intangible Asset, Useful Life 15 years    
Other Intangible Assets      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 798 686  
Accumulated amortization (515) (423)  
Finite-Lived Intangible Assets, Net, Total $ 283 $ 263