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Commitments, Contingencies and Other Items - Operating lease income (Details) - USD ($)
$ in Millions
2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2017
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Operating Leased Assets [Line Items]        
Rental income $ 28   $ 192 $ 165
Future Minimum Receipts        
2019     135  
2020     90  
2021     78  
2022     73  
2023     $ 69  
Predecessor        
Operating Leased Assets [Line Items]        
Rental income   $ 138