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Postemployment Benefit Plans (Assumptions) (Details) - plan | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
U.S. | Funded Plan |  |  |
Postemployment Benefit Plans |  |  |
Number of benefit plans | 3 |  |
U.S. | Unfunded Plan |  |  |
Postemployment Benefit Plans |  |  |
Number of benefit plans | 3 |  |
U.K. | Funded Plan |  |  |
Postemployment Benefit Plans |  |  |
Number of benefit plans | 1 |  |
Norway | Funded Plan |  |  |
Postemployment Benefit Plans |  |  |
Number of benefit plans | 4 |  |
Norway | Unfunded Plan |  |  |
Postemployment Benefit Plans |  |  |
Number of benefit plans | 2 |  |
Transocean Plans | U.S. |  |  |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate (as a percent) | 3.27% | 4.31% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate (as a percent) | 4.32% | 3.68% | 4.26%
Expected rate of return (as a percent) | 6.20% | 6.21% | 6.31%
Transocean Plans | Non-U.S. Plans |  |  |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate (as a percent) | 2.13% | 2.86% |
Compensation trend rate (as a percent) | 2.25% | 2.75% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate (as a percent) | 2.86% | 2.49% | 2.69%
Expected rate of return (as a percent) | 4.39% | 4.72% | 4.79%
Compensation trend rate (as a percent) | 2.75% | 2.50% | 2.25%
OPEB Plans |  |  |
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate (as a percent) | 2.39% | 3.56% |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate (as a percent) | 3.56% | 2.93% | 3.08%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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