Earnings Per Share - Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share:
Net income available to common shareholders	$ 623	$ 631	$ 1,719	$ 1,631
Less: Income allocated to participating securities	0	0	0	1
Net income allocated to common shareholders	$ 623	$ 631	$ 1,719	$ 1,630
Average shares (in shares)	684,224,277	689,278,078	684,090,872	688,617,910
Earnings per share (in dollars per share)	$ 0.91	$ 0.91	$ 2.51	$ 2.37
Earnings Per Diluted Share:
Net income available to common shareholders	$ 623	$ 631	$ 1,719	$ 1,631
Stock-based awards	0	0	0	0
Less: Income allocated to participating securities	0	0	0	1
Net income allocated to common shareholders	$ 623	$ 631	$ 1,719	$ 1,630
Average shares, stock based awards (in shares)	3,000,000	6,000,000	4,000,000	6,000,000
Average shares (in shares)	687,059,147	694,592,855	687,661,319	695,207,279
Earnings per diluted share (in dollars per share)	$ 0.91	$ 0.91	$ 2.50	$ 2.34