CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 1,814	$ (88)	$ (1,304)
Other Comprehensive Income
Pension and other postretirement benefit plans obligations (net of taxes of $8, $3, and $7, at respective dates)	21	7	(17)
Net unrealized losses on available-for-sale securities (net of taxes of $3, $0, and $0, respectively)	(6)	0	0
Total other comprehensive income (loss)	15	7	(17)
Comprehensive Income (Loss)	1,829	(81)	(1,321)
Preferred stock dividend requirement of subsidiary	14	14	14
Comprehensive Income (Loss) Attributable to Common Shareholders	$ 1,815	$ (95)	$ (1,335)