CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 1,173	$ (2,675)	$ (609)	$ 80	$ (1,502)	$ (529)
Change in value of pension and other postretirement liabilities:
Settlement adjustment	[1]	0		3		0	3
Comprehensive income (loss)		$ 1,173	$ (2,675)	$ (606)	$ 80	$ (1,502)	$ (526)

[1] Settlement adjustment was less than $1 million for the three and six months ended June 30, 2022. Settlement adjustment reflects $1 million in tax benefits for the three and six months ended June 30, 2021.