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, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share:
Net income available to common shareholders	$ 2,212	$ 2,330	$ 2,659
Less: Income allocated to participating securities	0	2	7
Net income allocated to common shareholders	$ 2,212	$ 2,328	$ 2,652
Average shares (in shares)	684,172,079	688,633,659	702,188,552
Earnings per share (in dollars per share)	$ 3.23	$ 3.38	$ 3.78
Earnings Per Diluted Share:
Net income available to common shareholders	$ 2,212	$ 2,330	$ 2,659
Stock-based awards	0	0	0
Less: Income allocated to participating securities	0	2	7
Net income allocated to common shareholders	$ 2,212	$ 2,328	$ 2,652
Average shares, stock based awards (in shares)	4,000,000	6,000,000	9,000,000
Average shares (in shares)	687,678,291	694,952,038	711,197,805
Earnings per diluted share (in dollars per share)	$ 3.22	$ 3.35	$ 3.73