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Accrued Expenses and Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2023
Accrued Liabilities and Other Liabilities [Abstract] |
ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES | 8. 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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Operating lease liabilities (see Note 5) | $ | 360 |  |  | $ | 311 |  |  | $ | 753 |  |  | $ | 776 |
Liability for unrecognized tax benefits | — |  |  | — |  |  | 238 |  |  | 239 |
Defined benefit plan liabilities (see Note 13) | 55 |  |  | 35 |  |  | 476 |  |  | 448 |
Repatriation tax liability (see Note 15) (a) | — |  |  | — |  |  | 167 |  |  | 301 |
Environmental liabilities | 23 |  |  | 21 |  |  | 294 |  |  | 296 |
Wage and other employee-related liabilities | 392 |  |  | 388 |  |  | 90 |  |  | 87 |
Accrued interest expense | 83 |  |  | 67 |  |  | — |  |  | — |
Contract liabilities from contracts with customers (see Note 17) | 40 |  |  | 129 |  |  | — |  |  | — |
Blending program obligations (see Note 19) | 83 |  |  | 189 |  |  | — |  |  | — |
Other accrued liabilities | 204 |  |  | 75 |  |  | 245 |  |  | 163 |
Accrued expenses and other long-term liabilities | $ | 1,240 |  |  | $ | 1,215 |  |  | $ | 2,263 |  |  | $ | 2,310 |
________________________ (a)The current portion of repatriation tax liability is included in income taxes payable. As of December 31, 2023 and 2022, the current portion of repatriation tax liability was $134 million and $100 million, respectively.

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