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Accumulated other comprehensive income/(loss) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 154 $ 6,959 $ 1,793 $ 3,035
Other comprehensive (loss)/income (7) 0 (13) (6)
Ending balance 3,035 154 (3,140) 1,793
Accumulated other comprehensive income/(loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0 58 (13) (7)
Other comprehensive (loss)/income (7)   (13) (6)
Ending balance (7) $ 0 (26) (13)
Actuarial gain/(loss) relating to pension        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     0 1
Other comprehensive (loss)/income     (2) (1)
Ending balance 1   (2) 0
Share in unrealized losses from associated companies        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (13) (5)
Other comprehensive (loss)/income     (15) (8)
Ending balance (5)   (28) (13)
Change in debt component on Archer facility        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     0 (3)
Other comprehensive (loss)/income     4 3
Ending balance $ (3)   $ 4 $ 0