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Other liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Taxes payable | $ 29 | $ 33 |
Contract liabilities | 31 | 29 | $ 21
Unfavorable drilling contracts | 7 | 8 |
Employee withheld taxes, social security and vacation payments | 47 | 51 |
Accrued interest expense | 38 | 40 |
Accrued expenses | 110 | 137 |
Lease liabilities | 68 | 36 |
Uncertain tax positions | 79 | 83 |
Other liabilities | 27 | 33 |
Total Other Liabilities | $ 436 | $ 450 |
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