CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss		$ (146)	$ (2,013)
Other comprehensive income (loss) items:
Losses on derivatives		1	0
Pension and postretirement gain (loss)	[1]	52	(111)
Other		0	(2)
Other comprehensive income (loss), net of tax		53	(113)
Comprehensive loss attributable to preferred and common stockholders		$ (93)	$ (2,126)

[1] Net of tax expense of $15 million and tax benefit of $31 million for the three months ended March 31, 2021 and 2020, respectively.