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Accrued Expenses and Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2021
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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Operating lease liabilities (see Note 6) | $ | 315 |  |  | $ | 285 |  |  | $ | 940 |  |  | $ | 885 |
Liability for unrecognized tax benefits (see Note 16) | — |  |  | — |  |  | 863 |  |  | 859 |
Defined benefit plan liabilities (see Note 14) | 41 |  |  | 45 |  |  | 601 |  |  | 878 |
Repatriation tax liability (see Note 16) (a) | — |  |  | — |  |  | 367 |  |  | 422 |
Environmental liabilities | 35 |  |  | 59 |  |  | 269 |  |  | 272 |
Wage and other employee-related liabilities | 349 |  |  | 210 |  |  | 133 |  |  | 124 |
Accrued interest expense | 88 |  |  | 99 |  |  | — |  |  | — |
Contract liabilities from contracts with customers (see Note 18) | 78 |  |  | 55 |  |  | — |  |  | — |
Blending program obligations (see Note 20) | 268 |  |  | 159 |  |  | — |  |  | — |
Other accrued liabilities | 79 |  |  | 82 |  |  | 231 |  |  | 180 |
Accrued expenses and other long-term liabilities | $ | 1,253 |  |  | $ | 994 |  |  | $ | 3,404 |  |  | $ | 3,620 |
________________________ (a)The current portion of repatriation tax liability is included in income taxes payable. There was no current portion of repatriation tax liability as of December 31, 2021, as it was deemed paid in connection with the additional tax net operating loss (NOL) carryback on the superseding 2020 federal income tax return filed in the fourth quarter of 2021. As of December 31, 2020, the current portion of repatriation tax liability was $54 million.

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