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Revenue from Contracts with Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Change In Contract With Customer, Asset And Liability [Roll Forward] |  |
Contract assets, beginning balance | $ 0 | $ 1
Contract liabilities, beginning balance | (29) | (21)
Contract assets (liabilities), net, beginning balance | (29) | (20)
Amortization of revenue that was included in the beginning contract liability balance | 23 | 14
Cash received, excluding amounts recognized as revenue | (25) | (22)
Cash received against the beginning contract asset balance |  | (1)
Contract assets, ending balance | 0 | 0
Contract liabilities, ending balance | (31) | (29)
Contract assets (liabilities), net, ending balance | $ (31) | $ (29)

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- Definition Change In Contract With Customer, Asset And Liability [Roll Forward] + References No definition available. + Details
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- Definition Contract with Customer, Asset, Cash Received Applied to Beginning Balance + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Contract with Customer, Asset (Liability), Net + References No definition available. + Details
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Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract with Customer, Liability, Cash Received Not Recognized as Revenue + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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Balance Type: | debit
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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