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Non-controlling interest (Tables)
6 Months Ended
Jun. 30, 2021
Noncontrolling Interest [Abstract]  
Schedule of changes in non-controlling interest
Changes in redeemable non-controlling interest for the periods presented in this report were as follows:
(In $ millions)SFL VIEsSeadrill Nigeria Operations LimitedTotal
As at January 1, 2020140 11 151 
Net loss attributable to non-controlling interest (2)— (2)
Share buyback of Heirs Holding shares in Seadrill Nigeria Operations (11)(11)
As at June 30, 2020138  138 

(In $ millions)SFL VIEsSeadrill Nigeria Operations LimitedTotal
As at January 1, 2021   
As at June 30, 2021