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Impairment Expense | 12 Months Ended
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Dec. 31, 2023
Impairment Expense [Abstract] |
Impairment Expense | Impairment Expense Impairment expense was as follows for the years ended December 31, 2023, 2022 and 2021 (in millions):
| 2023 |  | 2022 |  | 2021
Proved properties | $ | 44 |  |  | $ | 120 |  |  | $ | 20 |
Unproved properties (1) | 125 |  |  | 206 |  |  | 310 |
Other assets | 31 |  |  | 29 |  |  | 28 |
Inventories | — |  |  | 25 |  |  | 13 |
Firm commitment contracts | 2 |  |  | 2 |  |  | 5 |
Total | $ | 202 |  |  | $ | 382 |  |  | $ | 376 |
(1) Unproved properties with acquisition costs that are not individually significant are aggregated, and the portion of such costs estimated to be nonproductive is amortized over the remaining lease term. Unproved properties with individually significant acquisition costs are reviewed individually for impairment. Impairments of unproved oil and gas properties included $38 million in 2021 for the decision in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman. See Note 1.

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