Impairment Expense (Tables)

12 Months Ended

Dec. 31, 2023

Impairment Expense [Abstract]

Schedule of Impairment Expenses

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.