Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 1,500	$ 1,496	$ 3,194	$ 2,925
Less:
Net income attributable to noncontrolling interests	17	15	34	36
Preferred stock dividends	127	71	195	116
Preferred stock discount accretion and redemptions	2	1	4	3
Net income attributable to common shareholders	1,354	1,409	2,961	2,770
Less: Dividends and undistributed earnings allocated to nonvested restricted shares	7	7	15	13
Net income attributable to basic common shareholders	$ 1,347	$ 1,402	$ 2,946	$ 2,757
Basic weighted-average common shares outstanding (in shares)	401	414	401	417
Basic earnings per common share (in dollars per share)	$ 3.36	$ 3.39	$ 7.35	$ 6.62
Net income attributable to diluted common shareholders	$ 1,347	$ 1,402	$ 2,946	$ 2,757
Dilutive potential common shares (in shares)
Diluted weighted-average common shares outstanding (in shares)	401	414	401	417
Diluted earnings per common share (in dollars per share)	$ 3.36	$ 3.39	$ 7.34	$ 6.61