CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 1,557	$ 1,849	$ (25)
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost and net (gain) loss, including (gain) loss on settlements and curtailments included in net periodic pension cost	[1]	(2)	(3)	2
Net actuarial gain (loss) incurred in period	[2]	7	34	11
Tax valuation allowance release impact on pension settlements		(14)	0	0
Total change in value of pension and postretirement liabilities		(9)	31	13
Comprehensive income (loss)		$ 1,548	$ 1,880	$ (12)

[1] Includes tax effects that were not significant for 2021 which were netted against the valuation allowance and therefore included in accumulated other comprehensive income.

[2] Includes tax effect gains which were not significant for all periods presented and were netted against a valuation allowance and therefore included in accumulated other comprehensive income.