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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Net income for common stock	$ 202	$ 226	$ 922	$ 1,658
Weighted average common shares outstanding – basic (shares)	345.9	345.9	345.7	349.8
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)	1.2	1.5	1.2	1.5
Adjusted weighted average common shares outstanding – diluted (shares)	347.1	347.4	346.9	351.3
Net income per common share - basic (dollars per share)	$ 0.58	$ 0.65	$ 2.67	$ 4.74
Net income per common share - diluted (dollars per share)	$ 0.58	$ 0.65	$ 2.66	$ 4.72