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
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share:
Net income available to common shareholders	$ 535	$ 474
Less: Income allocated to participating securities	0	1
Net income allocated to common shareholders	$ 535	$ 473
Average shares (in shares)	684,017,462	687,537,989
Earnings per share (in dollars per share)	$ 0.78	$ 0.69
Earnings Per Diluted Share:
Net income available to common shareholders	$ 535	$ 474
Stock-based awards	0	0
Less: Income allocated to participating securities	0	1
Net income allocated to common shareholders	$ 535	$ 473
Average shares, stock based awards (in shares)	6,000,000	8,000,000
Average shares (in shares)	689,566,425	696,242,395
Earnings per diluted share (in dollars per share)	$ 0.78	$ 0.68