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
	Mar. 31, 2024	Mar. 31, 2023
Accounting Policies [Abstract]
Net income for common stock	$ 720	$ 1,433
Weighted average common shares outstanding – basic (shares)	345.5	352.9
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.3	1.3
Adjusted weighted average common shares outstanding – diluted (shares)	346.8	354.2
Net income per common share - basic (dollars per share)	$ 2.08	$ 4.06
Net income per common share - diluted (dollars per share)	$ 2.08	$ 4.05