Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 1,694	$ 1,429
Less:
Net income attributable to noncontrolling interests	17	21
Preferred stock dividends	68	45
Preferred stock discount accretion and redemptions	2	2
Net income attributable to common shareholders	1,607	1,361
Less: Dividends and undistributed earnings allocated to nonvested restricted shares	8	6
Net income attributable to basic common shareholders	$ 1,599	$ 1,355
Basic weighted-average common shares outstanding (in shares)	401,000	420,000
Basic earnings per common share (in dollars per share)	$ 3.98	$ 3.23
Net income attributable to diluted common shareholders	$ 1,599	$ 1,355
Dilutive potential common shares (in shares)	1,000
Diluted weighted-average common shares outstanding (in shares)	402,000	420,000
Diluted earnings per common share (in dollars per share)	$ 3.98	$ 3.23