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, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Net income for common stock	$ 2,519	$ 1,660	$ 1,346
Weighted average common shares outstanding – basic (in shares)	347.7	354.5	348.4
Add: Incremental shares attributable to effect of potentially dilutive securities (in shares)	1.6	1.3	1.0
Adjusted weighted average common shares outstanding – diluted (in shares)	349.3	355.8	349.4
Net income per common share — basic (in dollars per share)	$ 7.25	$ 4.68	$ 3.86
Net income per common share — diluted (in dollars per share)	$ 7.21	$ 4.66	$ 3.85