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Accumulated other comprehensive (loss)/income (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (3,140) $ 1,793
Other comprehensive (loss)/income 5 (22)
Ending balance (3,740) (98)
Other comprehensive income tax 0 2
AOCI Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (26) (13)
Other comprehensive (loss)/income 5 (22)
Ending balance (21) (35)
Actuarial loss relating to pension    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2) 0
Other comprehensive (loss)/income 0 (7)
Ending balance (2) (7)
Share in unrealized loss from associated companies    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (28) (13)
Other comprehensive (loss)/income 4 (17)
Ending balance (24) (30)
Change in debt component on Archer bond    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 4 0
Other comprehensive (loss)/income 1 2
Ending balance $ 5 $ 2