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Other Liabilities - Liability Balances (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Other Liabilities [Abstract] |  |  |  |
Uncertain tax provisions | $ 84 | $ 79 |  |
Lease liabilities | 71 | 68 |  |
Accrued expenses | 69 | 110 |  |
Employee withheld taxes, social security and vacation payments | 43 | 47 |  |
Contract liabilities | 31 | 31 | $ 33 | $ 29
Accrued interest expense | 30 | 38 |  |
Taxes payable | 36 | 29 |  |
Unfavorable drilling contracts | 7 | 7 |  |
Other liabilities | 9 | 27 |  |
Total Other Liabilities | $ 380 | $ 436 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Total Other Liabilities | Total Other Liabilities |  |

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