Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Net income for common stock	$ 1,820	$ 2,519	$ 1,660
Weighted average common shares outstanding – basic (in shares)	346.0	347.7	354.5
Add: Incremental shares attributable to effect of potentially dilutive securities (in shares)	1.3	1.6	1.3
Adjusted weighted average common shares outstanding – diluted (in shares)	347.3	349.3	355.8
Net income per common share — basic (in dollars per share)	$ 5.26	$ 7.25	$ 4.68
Net income per common share — diluted (in dollars per share)	$ 5.24	$ 7.21	$ 4.66