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, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Net income for common stock	$ 1,433	$ 602
Weighted average common shares outstanding – basic (shares)	352.9	354.1
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.3	1.0
Adjusted weighted average common shares outstanding – diluted (shares)	354.2	355.1
Net income per common share - basic (dollars per share)	$ 4.06	$ 1.70
Net income per common share - diluted (dollars per share)	$ 4.05	$ 1.70