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Accrued Expenses and Other Long-Term Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Expenses |  |  |
Operating lease liabilities, current |  | $ 285 | $ 331
Defined benefit plan liabilities, current |  | 45 | 37
Environmental liabilities, current |  | 59 | 27
Wage and other employee-related liabilities, current |  | 210 | 292
Accrued interest expense, current |  | 99 | 83
Contract liabilities from contracts with customers, current |  | 56 | 55
Environmental credit obligations, current |  | 159 | 31
Other accrued liabilities, current |  | 81 | 93
Accrued expenses |  | 994 | 949
Other Long-Term Liabilities |  |  |
Operating lease liabilities, noncurrent |  | 885 | 959
Liability for unrecognized tax benefits, noncurrent |  | 859 | 954
Defined benefit plan liabilities, noncurrent |  | 878 | 834
Repatriation tax liability, noncurrent | [1] | 422 | 508
Environmental liabilities, noncurrent |  | 272 | 319
Wage and other employee-related liabilities, noncurrent |  | 124 | 121
Other accrued liabilities, noncurrent |  | 180 | 192
Other long-term liabilities |  | 3,620 | 3,887
Accrued Expenses and Other Long-Term Liabilities (Textual) |  |  |
Current portion of repatriation tax liability, included in income taxes payable |  | $ 54 | $ 54
[1] | The current portion of repatriation tax liability is included in income taxes payable and was $54 million as of December 31, 2020 and 2019.

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