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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share:
Net income available to common shareholders	$ 2,330	$ 2,659	$ 1,323
Less: Income allocated to participating securities	2	7	6
Net income allocated to common shareholders	$ 2,328	$ 2,652	$ 1,317
Average shares (in shares)	688,633,659	702,188,552	714,729,585
Earnings per share (in dollars per share)	$ 3.38	$ 3.78	$ 1.84
Earnings Per Diluted Share:
Net income available to common shareholders	$ 2,330	$ 2,659	$ 1,323
Stock-based awards	0	0	0
Less: Income allocated to participating securities	2	7	6
Net income allocated to common shareholders	$ 2,328	$ 2,652	$ 1,317
Average shares, stock based awards (in shares)	6,000,000	9,000,000	5,000,000
Average shares (in shares)	694,952,038	711,197,805	719,735,415
Earnings per diluted share (in dollars per share)	$ 3.35	$ 3.73	$ 1.83