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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounting Policies [Abstract]
Net income for common stock	$ 613	$ 538	$ 1,470	$ 1,122
Weighted average common shares outstanding – basic (shares)	354.6	353.4	354.4	346.8
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.3	0.7	1.3	0.7
Adjusted weighted average common shares outstanding – diluted (shares)	355.9	354.1	355.7	347.5
Net income per common share - basic (dollars per share)	$ 1.73	$ 1.52	$ 4.15	$ 3.23
Net income per common share - diluted (dollars per share)	$ 1.72	$ 1.52	$ 4.13	$ 3.23