Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 1,640	$ 1,490	$ 4,565	$ 4,419
Less:
Net income attributable to noncontrolling interests	16	16	52	38
Preferred stock dividends	65	57	181	162
Preferred stock discount accretion and redemptions	1	1	4	3
Net income attributable to common shareholders	1,558	1,416	4,328	4,216
Less: Dividends and undistributed earnings allocated to nonvested restricted shares	8	8	21	21
Net income attributable to basic common shareholders	$ 1,550	$ 1,408	$ 4,307	$ 4,195
Basic weighted-average common shares outstanding (in shares)	410	426	414	426
Basic earnings per common share (in dollars per share)	$ 3.78	$ 3.31	$ 10.39	$ 9.84
Net income attributable to diluted common shareholders	$ 1,550	$ 1,408	$ 4,307	$ 4,195
Dilutive potential common shares (in shares)			1	1
Diluted (in shares)	410	426	415	427
Diluted earnings per common share (in dollars per share)	$ 3.78	$ 3.30	$ 10.39	$ 9.83