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Non-controlling interest - Schedule of Changes in Non-Controlling Interest (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Changes in non-controlling interest [Roll Forward]
Balance, beginning of period	$ 0	$ 151
Net loss attributable to non-controlling interest	0	(2)
Share buyback of Heirs Holding shares in Seadrill Nigeria Operations		(11)
Balance, end of period	0	138
SFL VIEs
Changes in non-controlling interest [Roll Forward]
Balance, beginning of period	0	140
Net loss attributable to non-controlling interest		(2)
Share buyback of Heirs Holding shares in Seadrill Nigeria Operations		0
Balance, end of period	0	138
Seadrill Nigeria Operations Limited
Changes in non-controlling interest [Roll Forward]
Balance, beginning of period	0	11
Net loss attributable to non-controlling interest		0
Share buyback of Heirs Holding shares in Seadrill Nigeria Operations		(11)
Balance, end of period	$ 0	$ 0

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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