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Fresh Start Accounting - Schedule of Weighted Average Cost of Capital (Details)		12 Months Ended
	Jul. 02, 2018	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
WACC		11.40%
Seadrill Capricorn Holdings LLC
Restructuring Cost and Reserve [Line Items]
WACC	11.40%
Seadrill Operating LP
Restructuring Cost and Reserve [Line Items]
WACC	12.00%
Seadrill Deepwater Drillship Ltd
Restructuring Cost and Reserve [Line Items]
WACC	12.00%
Seabras Sapura Holding
Restructuring Cost and Reserve [Line Items]
WACC	14.30%
Seabras Sapura Participacoes
Restructuring Cost and Reserve [Line Items]
WACC	13.70%
SeaMex
Restructuring Cost and Reserve [Line Items]
WACC	12.70%

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- Definition

Fair Value Assumptions, Weighted Average Cost of Capital

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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