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Redeemable non-controlling interest (Details) - Asia Offshore Drilling - USD ($) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 11, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Ownership interest in AOD | 100.00% |  |  |
Fair value of non-controlling interest | $ 31 |  |  |
Mermaid |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 33.76% |  |  |
Redeemable non-controlling interest |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Beginning balance |  | $ 57 |  |
Fair value adjustment |  | (30) |  |
Reclassifications of Temporary to Permanent Equity |  | (1) |  |
Ending balance |  | 26 |  |
Redeemable non-controlling interest |  | $ 26 | $ 0 | $ 0

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- Definition The difference between the carrying amount of a financial instrument subject to a registration payment arrangement recorded as temporary equity prior to adoption of FSP EITF 00-19-2 and the carrying amount reclassified to permanent equity upon the adoption of FSP EITF 00-19-2. Recorded as a cumulative effect adjustment to the beginning balance of retained earnings. Does not apply to registration payment arrangements that are no longer outstanding upon adoption of FSP EITF 00-19-2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123477628&loc=d3e90193-114008 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=122040564&loc=SL6540498-122764 + Details
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