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Related party transactions - Related Party Receivable Balances (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2018 | Apr. 30, 2021 | Dec. 31, 2020 | Mar. 13, 2020 | Dec. 31, 2019 | Apr. 26, 2017 | Apr. 25, 2017 | Nov. 30, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, allowance for credit losses |  |  | $ (292) |  |  |  | $ (306) |  |  |  |  |
Total related party receivables |  |  | 460 |  |  |  | 477 |  |  |  |  |
Amounts due from related parties - current |  |  | 50 |  |  |  | 85 |  |  |  |  |
Amounts due from related parties - non-current |  |  | 410 |  |  |  | 392 |  |  |  |  |
Working capital loan |  |  |  |  |  |  |  |  |  |  |  | $ 45
Impairment Of Related Party Note | [1] |  | 0 | $ 29 |  |  |  |  |  |  |  |
Related party convertible note receivable |  |  |  |  |  |  |  | $ 13 |  |  |  |
Archer |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivable before conversion |  |  |  |  |  |  |  |  |  | $ 146 |  |
Related party receivable after conversion |  |  |  |  |  |  |  |  |  | $ 45 |  |
Convertible note receivable, interest rate |  |  |  |  |  |  |  | 5.50% |  | 5.50% |  |
Convertible note receivable, fair value |  |  |  |  |  |  |  |  |  | $ 56 | $ 37 |
Gain on debt extinguishment |  |  |  |  | $ 19 |  |  |  |  |  |  |
Impairment Of Related Party Note |  |  | 29 |  |  |  |  |  |  |  |  |
Subordinated loans including accrued interest and fees | Archer Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivable |  |  |  |  |  |  |  | $ 11 |  |  |  |
Embedded derivative option | Archer Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivable |  |  |  |  |  |  |  | $ 8 |  |  |  |
Related party loans and interest |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, gross |  |  | 540 |  |  |  | 516 |  |  |  |  |
Total related party receivables |  |  | 540 |  |  |  | 516 |  |  |  |  |
Related party loans and interest | SeaMex seller's credit and loans receivable |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total related party receivables |  |  | 485 |  |  | $ 23 | 452 |  |  |  |  |
Sellers credit |  |  | 250 |  |  |  |  |  |  |  |  |
Interest receivable |  |  | $ 158 |  |  |  |  |  |  |  |  |
Sellers credit and working capital loans, interest rate |  |  | 6.50% |  |  |  |  |  |  |  |  |
Sponsor Minimum Liquidity Shortfall loan facility |  |  | $ 9 |  |  |  |  |  |  |  |  |
Related party loans and interest | SeaMex seller's credit and loans receivable | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sponsor Minimum Liquidity Shortfall loan facility, interest rate |  |  | 6.50% |  |  |  |  |  |  |  |  |
Related party loans and interest | Seabras loans receivable |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, gross |  |  | $ 41 |  |  |  |  |  |  |  |  |
Total related party receivables |  |  | 55 |  |  |  | 64 |  |  |  |  |
Interest receivable |  |  | $ 14 |  |  |  |  |  |  |  |  |
Repayment of loans |  | $ 16 |  |  |  |  |  |  |  |  |  |
Related party loans and interest | Seabras loans receivable | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party receivable |  |  | 3.40% |  |  |  |  |  |  |  |  |
Related party loans and interest | Seabras loans receivable | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party receivable |  |  | 3.99% |  |  |  |  |  |  |  |  |
Deferred consideration arrangements |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, gross |  |  | $ 0 |  |  |  | 3 |  |  |  |  |
Deferred consideration arrangements | Seadrill Partners | Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total related party receivables |  |  | 0 |  |  |  | 3 |  |  |  |  |
Convertible bond |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, gross |  |  | 19 |  |  |  | 13 |  |  |  |  |
Trading balances |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party receivables, gross |  |  | 193 |  |  |  | 251 |  |  |  |  |
Loan facility | Seabras loans receivable |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loans |  | 10 |  |  |  |  |  |  |  |  |  |
Shareholder loans | Seabras loans receivable |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loans |  | $ 6 |  |  |  |  |  |  |  |  |  |
Due From Related Party, Deferred Compensation Arrangements, Mobilization Receivable | Seadrill Partners | Disposed of by sale | West Vela |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total related party receivables |  |  | 0 |  |  |  | 2 |  |  |  |  |
Due From Related Party, Deferred Compensation Arrangements, Share Of Dayrate | Seadrill Partners | Disposed of by sale | West Vela |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total related party receivables |  |  | $ 0 |  |  |  | $ 1 |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties |  |  |  |  |  |  |  |  | $ 29 |  |  |
Seadrill Partners | Disposed of by sale | West Polaris | Fair value |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total related party receivables |  |  |  |  |  |  |  |  | $ 1 |  |  |
[1] | Includes transactions with related parties. Refer to Note 28 – Related party transactions.

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- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=sdrl_DueFromRelatedPartyLoansAndInterestMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |