CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Loss	$ (88)	$ (1,304)	$ (7,642)
Other Comprehensive Income (Loss)
Pension and other postretirement benefit plans obligations (net of taxes of $3, $7, and $0, at respective dates)	7	(17)	(1)
Total other comprehensive income (loss)	7	(17)	(1)
Comprehensive Loss	(81)	(1,321)	(7,643)
Preferred stock dividend requirement of subsidiary	14	14	14
Comprehensive Loss Attributable to Common Shareholders	$ (95)	$ (1,335)	$ (7,657)