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Loss per share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]        
Net loss attributable to the parent $ (602) $ (3,881) $ (4,659) $ (1,219)
Less: Allocation to participating securities 0 0 0 0
Net loss available to stockholders (602) (3,881) (4,659) (1,219)
Effect of dilution 0 0 0 0
Diluted net loss available to stockholders $ (602) $ (3,881) $ (4,659) $ (1,219)
Basic loss per share:        
Weighted average number of common shares outstanding (in shares) 100 504 100 100
Diluted loss per share:        
Effect of dilution (in shares) 0 0 0 0
Weighted average number of common shares outstanding adjusted for the effects of dilution (in shares) 100 504 100 100
Basic loss per share (usd per share) $ (6.02) $ (7.71) $ (46.43) $ (12.18)
Diluted loss per share (usd per share) $ (6.02) $ (7.71) $ (46.43) $ (12.18)