Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details)

v3.10.0.1
Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details)
$ in Millions
 1 Months Ended
Aug. 31, 2016
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]          
Cash and cash equivalents   $ 358 $ 1,029    
Total cash and cash equivalents and restricted cash at end of period   452 1,047 $ 572 $ 211
Number of cash flow issues the FASB guidance addresses | item 8        
ASU No. 2016-18 - Restricted Cash          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]          
Cash and cash equivalents   358 1,029 $ 562  
Restricted cash included in other current assets   $ 70 $ 8    
Restricted cash, current - location   us-gaap:OtherCurrentAssetsMember us-gaap:OtherCurrentAssetsMember us-gaap:OtherCurrentAssetsMember  
Restricted cash included in other assets   $ 24 $ 10 $ 10  
Restricted cash, noncurrent - location   us-gaap:OtherAssetsMember us-gaap:OtherAssetsMember us-gaap:OtherAssetsMember  
Total cash and cash equivalents and restricted cash at end of period   $ 452 $ 1,047 $ 572