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v3.20.4

Investment in associated companies - Statement of Operations (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | $ 541 | $ 712 | $ 1,059 | $ 1,388 |
Net operating (loss)/income | (175) | (613) | (4,482) | (295) |
Net (loss)/income | (602) | (3,881) | (4,659) | (1,219) |
Share in results from associated companies (net of tax) | $ (90) | $ 149 | $ (77) | $ (115) |
Seadrill Partners |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  | 18.00% |  |
Share in results from associated companies (net of tax) |  |  | $ (75) |  |
Seabras Sapura |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00% | 50.00% |
Net (loss)/income allocated to ownership interests | $ 44 | $ 46 | $ 38 | $ 57 |
Amortization of basis differences | (20) | 0 | (18) | (28) |
Share in results from associated companies (net of tax) | $ 24 | $ 46 | $ 20 | $ 29 |
SeaMex |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00% | 50.00% |
Net (loss)/income allocated to ownership interests | $ 2 | $ 4 | $ (6) | $ 9 |
Amortization of basis differences | (14) | 0 | (16) | (28) |
Share in results from associated companies (net of tax) | $ (12) | $ 4 | $ (22) | $ (19) |
Sonadrill |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 0.00% | 0.00% | 50.00% | 50.00% |
Net (loss)/income allocated to ownership interests | $ 0 | $ 0 | $ (2) | $ (1) |
Share in results from associated companies (net of tax) | $ 0 | $ 0 | $ (2) | $ (1) |
Gulfdrill |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage | 0.00% | 0.00% | 50.00% | 50.00% | 50.00%
Net (loss)/income allocated to ownership interests | $ 0 | $ 0 | $ 2 | $ 0 |
Share in results from associated companies (net of tax) | 0 | 0 | 2 | 0 |
Seadrill Partners |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | 426 | 612 |  | 750 |
Net operating (loss)/income | 100 | 257 |  | 51 |
Net (loss)/income | (127) | 201 |  | (187) |
Seabras Sapura |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | 232 | 241 | 360 | 434 |
Net operating (loss)/income | 124 | 125 | 103 | 198 |
Net (loss)/income | 88 | 92 | 75 | 113 |
SeaMex |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | 118 | 121 | 234 | 232 |
Net operating (loss)/income | 40 | 40 | 49 | 70 |
Net (loss)/income | 4 | 7 | (13) | 18 |
Sonadrill |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | 0 | 0 | 56 | 22 |
Net operating (loss)/income | 0 | 0 | (2) | (1) |
Net (loss)/income | 0 | 0 | (5) | (2) |
Gulfdrill |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Operating revenues | 0 | 0 | 44 | 0 |
Net operating (loss)/income | 0 | 0 | 6 | 0 |
Net (loss)/income | 0 | 0 | 4 | 0 |
Seadrill Partners - Direct ownership investments | Seadrill Partners |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net (loss)/income allocated to ownership interests | (59) | 77 |  | (92) |
Amortization of basis differences | (23) | 0 |  | (15) |
Share in results from associated companies (net of tax) | (82) | 77 | $ (75) | (107) |
Seadrill Partners - Subordinated Units | Seadrill Partners |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |
Net (loss)/income allocated to ownership interests | (15) | 22 |  | (17) |
Amortization of basis differences | (5) | 0 |  | 0 |
Share in results from associated companies (net of tax) | $ (20) | $ 22 | $ 0 | $ (17) |

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