Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounting Policies [Abstract]
Net income for common stock	$ 246	$ 202	$ 1,038	$ 922
Weighted average common shares outstanding – basic (shares)	360.4	345.9	354.5	345.7
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.3	1.2	1.3	1.2
Adjusted weighted average common shares outstanding – diluted (shares)	361.7	347.1	355.8	346.9
Net income per common share - basic (dollars per share)	$ 0.68	$ 0.58	$ 2.93	$ 2.67
Net income (loss) per common share - diluted (dollars per share)	$ 0.68	$ 0.58	$ 2.92	$ 2.66