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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share:
Net income available to common shareholders	$ 631	$ 684	$ 1,631	$ 2,032
Less: Income allocated to participating securities	0	1	1	5
Net income allocated to common shareholders	$ 631	$ 683	$ 1,630	$ 2,027
Average shares (in shares)	689,278,078	697,457,483	688,617,910	706,845,513
Earnings per share (in dollars per share)	$ 0.91	$ 0.98	$ 2.37	$ 2.87
Earnings Per Diluted Share:
Net income available to common shareholders	$ 631	$ 684	$ 1,631	$ 2,032
Stock-based awards	0	0	0	0
Less: Income allocated to participating securities	0	1	1	5
Net income allocated to common shareholders	$ 631	$ 683	$ 1,630	$ 2,027
Average shares, stock based awards (in shares)	6,000,000	9,000,000	6,000,000	9,000,000
Average shares (in shares)	694,592,855	706,089,674	695,207,279	715,803,010
Earnings per diluted share (in dollars per share)	$ 0.91	$ 0.97	$ 2.34	$ 2.83