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Other operating items - Additional Information (Details) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 03, 2020 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) rig | Dec. 31, 2020 USD ($) rig | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on impairment of long-lived assets |  | $ 0 | $ 414,000,000 | $ 4,087,000,000 | $ 0
Number of impaired rigs | rig |  |  | 3 | 15 |
Gain on disposals |  | $ 0 | $ 0 | $ 15,000,000 | $ 0
Line of Credit |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 2,000,000,000 |  |  |  |
West Epsilon |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on disposals | $ 12,000,000 |  |  |  |
West Telesto |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on disposals |  |  |  | $ 3,000,000 |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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