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General information - Reclassification of Previously Reported Amounts (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Management contract revenue | [1] | $ 56 | $ 38 | $ 289 | $ 338
Management contract expense | [1] | (44) | (45) | (390) | (302)
Selling, general and administrative expenses |  | (43) | (47) | (80) | (95)
Reimbursable revenues/ expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues |  | 16 | 21 | 37 | 41
Expenses |  | (15) | (18) | (34) | (39)
Other revenues |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues | [1] | 0 | 34 | 30 | 12
Vessel and rig operating expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Expenses |  | (341) | (417) | $ (606) | (726)
As previously reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Management contract revenue |  | 0 | 0 |  | 0
Management contract expense |  | 0 | 0 |  | 0
Selling, general and administrative expenses |  | (62) | (100) |  | (130)
As previously reported | Reimbursable revenues/ expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues |  | 26 | 21 |  | 264
Expenses |  | (24) | (20) |  | (262)
As previously reported | Other revenues |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues |  | 46 | 72 |  | 127
As previously reported | Vessel and rig operating expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Expenses |  | (357) | (407) |  | (770)
Adjustment |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Management contract revenue |  | 56 | 38 |  | 338
Management contract expense |  | (44) | (45) |  | (302)
Selling, general and administrative expenses |  | 19 | 53 |  | 35
Adjustment | Reimbursable revenues/ expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues |  | (10) | 0 |  | (223)
Expenses |  | 9 | 2 |  | 223
Adjustment | Other revenues |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Reimbursable and other revenues |  | (46) | (38) |  | (115)
Adjustment | Vessel and rig operating expenses |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Expenses |  | $ 16 | $ (10) |  | $ 44
[1] | Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + 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 Amount of revenue that is not accounted for under Topic 606. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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