CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 2,512	$ 2,256	$ 1,814
Other Comprehensive Income (Loss)
Pension and other postretirement benefit plans obligations (net of taxes of $3, $6, and $8, at respective dates)	(7)	(16)	21
Net unrealized gain (losses) on available-for-sale securities (net of taxes of $0, $3, and $3, respectively)	1	8	(6)
Total other comprehensive income (loss)	(6)	(8)	15
Comprehensive Income	2,506	2,248	1,829
Preferred stock dividend requirement of subsidiary	37	14	14
Comprehensive Income Attributable to Common Shareholders	$ 2,469	$ 2,234	$ 1,815