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Related party transactions - Sale and Leaseback Arrangements (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Nov. 30, 2008 | Oct. 31, 2008 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  | $ 98 | $ 116 | $ 148 | $ 162
West Taurus |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchase price |  | $ 850 |  |  |  |  |
West Hercules |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 850 |  |  |  |
West Linus |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchase price | $ 600 |  |  |  |  |  |
Ship Finance SPV's | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Remaining lease payments |  |  |  |  |  | 768 |
Purchase obligation |  |  |  |  |  | 378 |
Total commitment |  |  |  |  |  | 1,146 |
Fair value on initial recognition |  |  |  |  |  | 424 |
Book value |  |  |  |  |  | 426 |
Ship Finance SPV's | Affiliated Entity | West Taurus |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Remaining lease payments |  |  |  |  |  | 191 |
Purchase obligation |  |  |  |  |  | 154 |
Total commitment |  |  |  |  |  | 345 |
Fair value on initial recognition |  |  |  |  |  | 146 |
Book value |  |  |  |  |  | 147 |
Ship Finance SPV's | Affiliated Entity | West Hercules |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Remaining lease payments |  |  |  |  |  | 184 |
Purchase obligation |  |  |  |  |  | 138 |
Total commitment |  |  |  |  |  | 322 |
Fair value on initial recognition |  |  |  |  |  | 136 |
Book value |  |  |  |  |  | 137 |
Ship Finance SPV's | Affiliated Entity | West Linus |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Remaining lease payments |  |  |  |  |  | 393 |
Purchase obligation |  |  |  |  |  | 86 |
Total commitment |  |  |  |  |  | 479 |
Fair value on initial recognition |  |  |  |  |  | 142 |
Book value |  |  |  |  |  | $ 142 |

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- Definition Sale Leaseback Transaction, Fair Value On Initial Recognition + References No definition available. + Details
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- Definition Sale Leaseback Transaction, Minimum Lease Payments + References No definition available. + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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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. + References No definition available. + Details
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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 40 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121606570&loc=SL77919786-209982 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51843-112757 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=121602674&loc=d3e51831-112757 + Details
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