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Related party transactions - Analysis of Related Party Receivable Balances (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2016 | Mar. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Allowance for expected credit loss |  |  |  | $ (306) | $ 0 |  |
Total related party receivables |  |  |  | 477 | 704 |  |
Amounts due from related parties - current |  |  |  | 85 | 181 |  |
Amounts due from related parties - non-current |  |  |  | 392 | 523 |  |
Payments received on related party receivables |  | $ 22 | $ 2 | (105) | (14) |  |
Related party loans and interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables, gross |  |  |  | 516 | 488 |  |
Total related party receivables |  |  |  | 516 | 488 |  |
Deferred consideration arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables, gross |  |  |  | 3 | 31 |  |
Convertible bond |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables, gross |  |  |  | 13 | 35 |  |
Trading balances |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables, gross |  |  |  | 251 | 150 |  |
SeaMex seller's credit and loans receivable | Related party loans and interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | $ 452 | 422 |  |
Interest rate on related party receivable |  |  |  | 6.50% |  |  |
SeaMex seller's credit and loans receivable | Sellers credit |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  |  |  |  | $ 250
SeaMex seller's credit and loans receivable | Working capital loan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  |  |  | $ 45 |
SeaMex seller's credit and loans receivable | Accrued interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | $ 149 |  |  |
SeaMex seller's credit and loans receivable | Sponsor Minimum Liquidity Shortfall |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | $ 8 |  |  |
Interest rate on related party receivable |  |  |  | 6.50% |  |  |
Seabras Sapura | Related party loans and interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | $ 64 | 66 |  |
Payments received on related party receivables | $ 6 |  |  |  |  |  |
Seabras Sapura | Accrued interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | 14 |  |  |
Seabras Sapura | Loan principal |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | 50 |  |  |
Seabras Sapura | Due From Related Party, Loan Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payments received on related party receivables | 4 |  |  |  |  |  |
Seabras Sapura | Due From Related Party, Shareholder Loans |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payments received on related party receivables | $ 2 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seadrill Partners | Deferred consideration arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | 3 | 31 |  |
West Vela | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seadrill Partners | Mobilization receivable |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | 2 | 17 |  |
West Vela | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seadrill Partners | Share of dayrate |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  | $ 1 | 14 |  |
West Vela | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seadrill Partners | Share of dayrate | Fair value |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  |  | 29 |  |
West Polaris | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Seadrill Partners | Fair value |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party receivables |  |  |  |  | $ 1 |  |
Minimum | LIBOR | Seabras Sapura | Related party loans and interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on related party receivable |  |  |  | 3.40% |  |  |
Maximum | LIBOR | Seabras Sapura | Related party loans and interest |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on related party receivable |  |  |  | 3.99% |  |  |

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