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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounting Policies [Abstract]
Net income for common stock	$ 588	$ 526	$ 1,510	$ 2,185
Weighted average common shares outstanding – basic (shares)	346.2	345.0	345.9	348.4
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.3	1.5	1.3	1.5
Adjusted weighted average common shares outstanding – diluted (shares)	347.5	346.5	347.2	349.9
Net income per common share - basic (dollars per share)	$ 1.70	$ 1.53	$ 4.37	$ 6.27
Net income per common share - diluted (dollars per share)	$ 1.69	$ 1.52	$ 4.35	$ 6.24