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Related party transactions - Analysis of Related Party Payable Balances (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2017
Related Party Transaction [Line Items]        
Total related party liabilities $ 261   $ 258  
Amounts due to related parties - current (39)   (19)  
Long-term debt due to related parties (222)   (239)  
Debt principal outstanding 655   621  
Related party loans payable        
Related Party Transaction [Line Items]        
Total related party liabilities 222   239  
Trading balances        
Related Party Transaction [Line Items]        
Total related party liabilities 39   $ 19  
Ship Finance VIEs | Related party loans payable        
Related Party Transaction [Line Items]        
Interest rate on related party payable     4.50%  
Interest expense on related party payable 7 $ 7 $ 14 $ 15
Variable Interest Entity, primary beneficiary        
Related Party Transaction [Line Items]        
Long-term debt due to related parties 222   239  
Debt principal outstanding 314   314  
Trading asset positions held against long-term loan $ 4   $ 0