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Accrued Expenses and Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2020
Accrued Liabilities and Other Liabilities [Abstract] |
ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES | 9. ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES Accrued expenses and other long-term liabilities consisted of the following (in millions):
| Accrued Expenses |  | Other Long-Term Liabilities
| December 31, |  | December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
Operating lease liabilities (see Note 6) | $ | 285 |  |  | $ | 331 |  |  | $ | 885 |  |  | $ | 959 |
Liability for unrecognized tax benefits (see Note 16) | — |  |  | — |  |  | 859 |  |  | 954 |
Defined benefit plan liabilities (see Note 14) | 45 |  |  | 37 |  |  | 878 |  |  | 834 |
Repatriation tax liability (see Note 16) (a) | — |  |  | — |  |  | 422 |  |  | 508 |
Environmental liabilities | 59 |  |  | 27 |  |  | 272 |  |  | 319 |
Wage and other employee-related liabilities | 210 |  |  | 292 |  |  | 124 |  |  | 121 |
Accrued interest expense | 99 |  |  | 83 |  |  | — |  |  | — |
Contract liabilities from contracts with customers (see Note 18) | 56 |  |  | 55 |  |  | — |  |  | — |
Environmental credit obligations (see Note 20) | 159 |  |  | 31 |  |  | — |  |  | — |
Other accrued liabilities | 81 |  |  | 93 |  |  | 180 |  |  | 192 |
Accrued expenses and other long-term liabilities | $ | 994 |  |  | $ | 949 |  |  | $ | 3,620 |  |  | $ | 3,887 |
________________________ (a)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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