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Redeemable non-controlling interest (Tables)
6 Months Ended
Jun. 30, 2021
Temporary Equity Disclosure [Abstract]  
Schedule of changes in redeemable non-controlling interest
Changes in redeemable non-controlling interest for the periods presented in this report were as follows:

(In $ millions) Asia Offshore Drilling Ltd
As at January 1, 202057 
Fair value adjustment(30)
Net loss attributable to redeemable non-controlling interest in the period(1)
As at June 30, 202026 

(In $ millions) Asia Offshore Drilling Ltd
As at January 1, 2021 
As at June 30, 2021