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Postemployment Benefit Plans (Funded) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in projected benefit obligation |  |  |
Projected benefit obligation, beginning of period | $ 1,882 | $ 2,078 |
Assumed projected benefit obligation |  | 29 |
Actuarial (gains) losses, net | 248 | (192) |
Service cost | 7 | 7 | $ 6
Interest cost | 74 | 72 | 76
Currency exchange rate changes | 14 | (21) |
Benefits paid | (93) | (90) |
Settlements | (24) | (3) |
Plan amendments |  | 1 |
Special termination benefits |  | 1 |
Projected benefit obligation, end of period | 2,108 | 1,882 | 2,078
Change in plan assets |  |  |
Fair value of plan assets, beginning of period | 1,567 | 1,736 |
Fair value of acquired plan assets |  | 22 |
Actual return on plan assets | 311 | (93) |
Currency exchange rate changes | 16 | (22) |
Employer contributions | 22 | 17 | 15
Benefits paid | (93) | (90) |
Settlements | (24) | (3) |
Fair value of plan assets, end of period | 1,799 | 1,567 | 1,736
Funded status, end of period | (309) | (315) |
Balance sheet classification, end of period: |  |  |
Pension asset, non-current | 42 | 47 |
Pension liability, current | (5) | (7) |
Pension liability, non-current | (346) | (355) |
Accumulated other comprehensive loss (income), before taxes | 376 | 356 |
Accumulated benefit obligation, end of period | 2,098 | 1,872 |
Aggregate projected benefit obligation and fair value of plan assets for plans with a projected benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 1,769 | 1,570 |
Fair value of plan assets | 1,418 | 1,209 |
Aggregate accumulated benefit obligation and fair value of plan assets for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | 1,714 | 1,547 |
Fair value of plan assets | 1,369 | 1,189 |
Transocean Plans |  |  |
Change in plan assets |  |  |
Fair value of plan assets, beginning of period | 1,567 |  |
Fair value of plan assets, end of period | 1,799 | 1,567 |
Transocean Plans | U.S. |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation, beginning of period | 1,527 | 1,680 |
Actuarial (gains) losses, net | 202 | (145) |
Service cost |  |  | 3
Interest cost | 63 | 61 | 65
Benefits paid | (72) | (69) |
Settlements | (24) |  |
Projected benefit obligation, end of period | 1,696 | 1,527 | 1,680
Change in plan assets |  |  |
Fair value of plan assets, beginning of period | 1,189 | 1,343 |
Actual return on plan assets | 272 | (87) |
Employer contributions | 4 | 2 |
Benefits paid | (72) | (69) |
Settlements | (24) |  |
Fair value of plan assets, end of period | 1,369 | 1,189 | 1,343
Funded status, end of period | (327) | (338) |
Balance sheet classification, end of period: |  |  |
Pension liability, current | (1) | (3) |
Pension liability, non-current | (326) | (335) |
Accumulated other comprehensive loss (income), before taxes | 304 | 307 |
Accumulated benefit obligation, end of period | 1,696 | 1,527 |
Aggregate projected benefit obligation and fair value of plan assets for plans with a projected benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 1,696 | 1,527 |
Fair value of plan assets | 1,369 | 1,189 |
Aggregate accumulated benefit obligation and fair value of plan assets for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | 1,696 | 1,527 |
Fair value of plan assets | 1,369 | 1,189 |
Transocean Plans | Non-U.S. Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation, beginning of period | 338 | 379 |
Assumed projected benefit obligation |  | 29 |
Actuarial (gains) losses, net | 45 | (45) |
Service cost | 7 | 7 | 3
Interest cost | 10 | 10 | 11
Currency exchange rate changes | 14 | (21) |
Benefits paid | (19) | (19) |
Settlements |  | (3) |
Plan amendments |  | 1 |
Projected benefit obligation, end of period | 395 | 338 | 379
Change in plan assets |  |  |
Fair value of plan assets, beginning of period | 378 | 393 |
Fair value of acquired plan assets |  | 22 |
Actual return on plan assets | 39 | (6) |
Currency exchange rate changes | 16 | (22) |
Employer contributions | 16 | 13 |
Benefits paid | (19) | (19) |
Settlements |  | (3) |
Fair value of plan assets, end of period | 430 | 378 | 393
Funded status, end of period | 35 | 40 |
Balance sheet classification, end of period: |  |  |
Pension asset, non-current | 42 | 47 |
Pension liability, current | (1) | (1) |
Pension liability, non-current | (6) | (6) |
Accumulated other comprehensive loss (income), before taxes | 84 | 64 |
Accumulated benefit obligation, end of period | 385 | 328 |
Aggregate projected benefit obligation and fair value of plan assets for plans with a projected benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 56 | 26 |
Fair value of plan assets | 49 | 20 |
Aggregate accumulated benefit obligation and fair value of plan assets for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | 1 | 3 |
OPEB Plans |  |  |
Change in projected benefit obligation |  |  |
Projected benefit obligation, beginning of period | 17 | 19 |
Actuarial (gains) losses, net | 1 | (2) |
Interest cost | 1 | 1 |
Benefits paid | (2) | (2) |
Special termination benefits |  | 1 |
Projected benefit obligation, end of period | 17 | 17 | $ 19
Change in plan assets |  |  |
Employer contributions | 2 | 2 |
Benefits paid | (2) | (2) |
Funded status, end of period | (17) | (17) |
Balance sheet classification, end of period: |  |  |
Pension liability, current | (3) | (3) |
Pension liability, non-current | (14) | (14) |
Accumulated other comprehensive loss (income), before taxes | (12) | (15) |
Accumulated benefit obligation, end of period | 17 | 17 |
Aggregate projected benefit obligation and fair value of plan assets for plans with a projected benefit obligation in excess of plan assets |  |  |
Projected benefit obligation | 17 | 17 |
Aggregate accumulated benefit obligation and fair value of plan assets for plans with an accumulated benefit obligation in excess of plan assets |  |  |
Accumulated benefit obligation | $ 17 | $ 17 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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