CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 2,256	$ 1,814	$ (88)
Other Comprehensive Income (Loss)
Pension and other postretirement benefit plans obligations (net of taxes of $6, $8, and $3, at respective dates)	(16)	21	7
Net unrealized losses on available-for-sale securities (net of taxes of $3, $3, and $0, respectively)	8	(6)	0
Total other comprehensive income (loss)	(8)	15	7
Comprehensive Income (Loss)	2,248	1,829	(81)
Preferred stock dividend requirement of subsidiary	14	14	14
Comprehensive Income (Loss) Attributable to Common Shareholders	$ 2,234	$ 1,815	$ (95)