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Postemployment Benefit Plans (Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair value of plan assets |  |  |
Total investments | $ 1,799 | $ 1,567 | $ 1,736
Funding contributions |  |  |
Employer contributions | 22 | $ 17 | 15
Projected pension benefits payments |  |  |
2020 | 90 |  |
2021 | 90 |  |
2022 | 92 |  |
2023 | 93 |  |
2024 | 95 |  |
2025-2029 | $ 481 |  |
U.S. |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 100.00% | 100.00% |
Total actual allocation percentage | 100.00% | 100.00% |
U.S. | Equity securities |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 50.00% | 50.00% |
Total actual allocation percentage | 51.00% | 50.00% |
U.S. | Fixed income securities |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 50.00% | 50.00% |
Total actual allocation percentage | 49.00% | 50.00% |
Non-U.S. Plans |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 100.00% | 100.00% |
Total actual allocation percentage | 100.00% | 100.00% |
Non-U.S. Plans | Equity securities |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 24.00% | 34.00% |
Total actual allocation percentage | 27.00% | 32.00% |
Non-U.S. Plans | Fixed income securities |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 60.00% | 51.00% |
Total actual allocation percentage | 56.00% | 52.00% |
Non-U.S. Plans | Other investments |  |  |
Weighted-average target allocations of the investments |  |  |
Total target allocation percentage | 16.00% | 15.00% |
Total actual allocation percentage | 17.00% | 16.00% |
Transocean Plans |  |  |
Fair value of plan assets |  |  |
Total investments | $ 1,799 | $ 1,567 |
Funding contributions |  |  |
Expected defined plan contributions next year | 18 |  |
Transocean Plans | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1,361 | 1,178 |
Transocean Plans | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 438 | 389 |
Transocean Plans | Mutual funds |  |  |
Fair value of plan assets |  |  |
Total investments | 1,719 | 1,498 |
Transocean Plans | Mutual funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1,352 | 1,171 |
Transocean Plans | Mutual funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 367 | 327 |
Transocean Plans | U.S. equity funds |  |  |
Fair value of plan assets |  |  |
Total investments | 481 | 401 |
Transocean Plans | U.S. equity funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 480 | 401 |
Transocean Plans | U.S. equity funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1 |  |
Transocean Plans | Non-U.S. equity funds |  |  |
Fair value of plan assets |  |  |
Total investments | 336 | 304 |
Transocean Plans | Non-U.S. equity funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 216 | 179 |
Transocean Plans | Non-U.S. equity funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 120 | 125 |
Transocean Plans | Bond funds |  |  |
Fair value of plan assets |  |  |
Total investments | 902 | 793 |
Transocean Plans | Bond funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 656 | 591 |
Transocean Plans | Bond funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 246 | 202 |
Transocean Plans | Other investments |  |  |
Fair value of plan assets |  |  |
Total investments | 80 | 69 |
Transocean Plans | Other investments | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 9 | 7 |
Transocean Plans | Other investments | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 71 | 62 |
Transocean Plans | Cash and money market funds |  |  |
Fair value of plan assets |  |  |
Total investments | 9 | 7 |
Transocean Plans | Cash and money market funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 9 | 7 |
Transocean Plans | Property collective trusts |  |  |
Fair value of plan assets |  |  |
Total investments | 20 | 19 |
Transocean Plans | Property collective trusts | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 20 | 19 |
Transocean Plans | Investment contracts |  |  |
Fair value of plan assets |  |  |
Total investments | 51 | 43 |
Transocean Plans | Investment contracts | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 51 | 43 |
Transocean Plans | U.S. |  |  |
Fair value of plan assets |  |  |
Total investments | 1,369 | 1,189 | 1,343
Funding contributions |  |  |
Employer contributions | 4 | 2 |
Projected pension benefits payments |  |  |
2020 | 79 |  |
2021 | 79 |  |
2022 | 81 |  |
2023 | 82 |  |
2024 | 82 |  |
2025-2029 | 419 |  |
Transocean Plans | U.S. | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1,357 | 1,177 |
Transocean Plans | U.S. | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 12 | 12 |
Transocean Plans | U.S. | Mutual funds |  |  |
Fair value of plan assets |  |  |
Total investments | 1,364 | 1,183 |
Transocean Plans | U.S. | Mutual funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1,352 | 1,171 |
Transocean Plans | U.S. | Mutual funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 12 | 12 |
Transocean Plans | U.S. | U.S. equity funds |  |  |
Fair value of plan assets |  |  |
Total investments | 481 | 401 |
Transocean Plans | U.S. | U.S. equity funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 480 | 401 |
Transocean Plans | U.S. | U.S. equity funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 1 |  |
Transocean Plans | U.S. | Non-U.S. equity funds |  |  |
Fair value of plan assets |  |  |
Total investments | 221 | 184 |
Transocean Plans | U.S. | Non-U.S. equity funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 216 | 179 |
Transocean Plans | U.S. | Non-U.S. equity funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 5 | 5 |
Transocean Plans | U.S. | Bond funds |  |  |
Fair value of plan assets |  |  |
Total investments | 662 | 598 |
Transocean Plans | U.S. | Bond funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 656 | 591 |
Transocean Plans | U.S. | Bond funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 6 | 7 |
Transocean Plans | U.S. | Other investments |  |  |
Fair value of plan assets |  |  |
Total investments | 5 | 6 |
Transocean Plans | U.S. | Other investments | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 5 | 6 |
Transocean Plans | U.S. | Cash and money market funds |  |  |
Fair value of plan assets |  |  |
Total investments | 5 | 6 |
Transocean Plans | U.S. | Cash and money market funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 5 | 6 |
Transocean Plans | Non-U.S. Plans |  |  |
Fair value of plan assets |  |  |
Total investments | 430 | 378 | $ 393
Funding contributions |  |  |
Employer contributions | 16 | 13 |
Projected pension benefits payments |  |  |
2020 | 8 |  |
2021 | 8 |  |
2022 | 8 |  |
2023 | 9 |  |
2024 | 10 |  |
2025-2029 | 59 |  |
Transocean Plans | Non-U.S. Plans | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 4 | 1 |
Transocean Plans | Non-U.S. Plans | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 426 | 377 |
Transocean Plans | Non-U.S. Plans | Mutual funds |  |  |
Fair value of plan assets |  |  |
Total investments | 355 | 315 |
Transocean Plans | Non-U.S. Plans | Mutual funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 355 | 315 |
Transocean Plans | Non-U.S. Plans | Non-U.S. equity funds |  |  |
Fair value of plan assets |  |  |
Total investments | 115 | 120 |
Transocean Plans | Non-U.S. Plans | Non-U.S. equity funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 115 | 120 |
Transocean Plans | Non-U.S. Plans | Bond funds |  |  |
Fair value of plan assets |  |  |
Total investments | 240 | 195 |
Transocean Plans | Non-U.S. Plans | Bond funds | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 240 | 195 |
Transocean Plans | Non-U.S. Plans | Other investments |  |  |
Fair value of plan assets |  |  |
Total investments | 75 | 63 |
Transocean Plans | Non-U.S. Plans | Other investments | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 4 | 1 |
Transocean Plans | Non-U.S. Plans | Other investments | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 71 | 62 |
Transocean Plans | Non-U.S. Plans | Cash and money market funds |  |  |
Fair value of plan assets |  |  |
Total investments | 4 | 1 |
Transocean Plans | Non-U.S. Plans | Cash and money market funds | Significant observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 4 | 1 |
Transocean Plans | Non-U.S. Plans | Property collective trusts |  |  |
Fair value of plan assets |  |  |
Total investments | 20 | 19 |
Transocean Plans | Non-U.S. Plans | Property collective trusts | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 20 | 19 |
Transocean Plans | Non-U.S. Plans | Investment contracts |  |  |
Fair value of plan assets |  |  |
Total investments | 51 | 43 |
Transocean Plans | Non-U.S. Plans | Investment contracts | Significant other observable inputs |  |  |
Fair value of plan assets |  |  |
Total investments | 51 | 43 |
OPEB Plans |  |  |
Funding contributions |  |  |
Employer contributions | 2 | $ 2 |
Expected defined plan contributions next year | 3 |  |
Projected pension benefits payments |  |  |
2020 | 3 |  |
2021 | 3 |  |
2022 | 3 |  |
2023 | 2 |  |
2024 | 3 |  |
2025-2029 | $ 3 |  |

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