Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 1,570	$ 1,640	$ 4,764	$ 4,565
Less:
Net income attributable to noncontrolling interests	16	16	50	52
Preferred stock dividends	104	65	299	181
Preferred stock discount accretion and redemptions	2	1	6	4
Net income attributable to common shareholders	1,448	1,558	4,409	4,328
Less: Dividends and undistributed earnings allocated to nonvested restricted shares	8	8	23	21
Net income attributable to basic common shareholders	$ 1,440	$ 1,550	$ 4,386	$ 4,307
Basic weighted-average common shares outstanding (in shares)	400	410	401	414
Basic earnings per common share (in dollars per share)	$ 3.60	$ 3.78	$ 10.95	$ 10.39
Net income attributable to diluted common shareholders	$ 1,440	$ 1,550	$ 4,386	$ 4,307
Dilutive potential common shares (in shares)				1
Diluted weighted-average common shares outstanding (in shares)	400	410	401	415
Diluted earnings per common share (in dollars per share)	$ 3.60	$ 3.78	$ 10.94	$ 10.39