Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 1,496	$ 1,103	$ 2,925	$ 2,929
Less:
Net income attributable to noncontrolling interests	15	12	36	22
Preferred stock dividends	71	48	116	105
Preferred stock discount accretion and redemptions	1	1	3	2
Net income attributable to common shareholders	1,409	1,042	2,770	2,800
Less: Dividends and undistributed earnings allocated to nonvested restricted shares	7	5	13	13
Net income attributable to basic common shareholders	$ 1,402	$ 1,037	$ 2,757	$ 2,787
Basic weighted-average common shares outstanding (in shares)	414	427	417	426
Basic earnings per common share (in dollars per share)	$ 3.39	$ 2.43	$ 6.62	$ 6.54
Net income attributable to diluted common shareholders	$ 1,402	$ 1,037	$ 2,757	$ 2,787
Dilutive potential common shares (in shares)				1
Diluted (in shares)	414	427	417	427
Diluted earnings per common share (in dollars per share)	$ 3.39	$ 2.43	$ 6.61	$ 6.53