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						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounting Policies [Abstract]
Net income for common stock	$ 688	$ 246	$ 791	$ 588	$ 202	$ 720	$ 1,726	$ 1,510
Weighted average common shares outstanding – basic (shares)	360.7			346.2			356.4	345.9
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.2			1.3			1.2	1.3
Adjusted weighted average common shares outstanding – diluted (shares)	361.9			347.5			357.6	347.2
Net income per common share - basic (dollars per share)	$ 1.91			$ 1.70			$ 4.84	$ 4.37
Net income per common share - diluted (dollars per share)	$ 1.90			$ 1.69			$ 4.83	$ 4.35