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General information (Policies)	9 Months Ended
	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	Basis of presentation The accompanying unaudited Condensed Consolidated Financial Statements of Seadrill Limited have been prepared in accordance with accounting principles generally accepted in the U.S. ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the SEC. Accordingly, pursuant to such rules and regulations, they do not include all disclosures required by U.S. GAAP for annual financial statements. In the opinion of management, the unaudited Condensed Consolidated Financial Statements includes all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of financial position, results of operations and cash flows for the interim periods. Results of operations for interim periods are not necessarily indicative of results of operations for the respective full years, or any future period. The accompanying unaudited Condensed Consolidated Financial Statements and related notes should be read in conjunction with our 2024 10-K. Certain reclassifications have been made to previously reported amounts to conform to the current period presentation. These reclassifications did not have a material effect on our unaudited Condensed Consolidated Financial Statements.
Significant accounting policies	Significant accounting policies Refer to Note 2 - "Accounting policies" of our Consolidated Financial Statements from our 2024 10-K for additional information related to our significant accounting policies.

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- Definition

Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483426/235-10-50-4

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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No definition available.

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