Earnings Per Common Share (Details) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022 USD ($) stockClass $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of common stock classes | stockClass		2
Net income		$ 7,183	$ 5,855	$ 3,299
Preferred stock dividends and other		(548)	(495)	(256)
Net Income Available to Common Stockholders		$ 6,635	$ 5,360	$ 3,043
Weighted-average common shares outstanding - basic (in shares) | shares		1,885	1,887	1,429
Basic earnings per share (USD per share) | $ / shares	[1]	$ 3.52	$ 2.84	$ 2.13
Weighted-average common shares outstanding - diluted (in shares) | shares		1,894	1,897	1,435
Diluted earnings per share (USD per share) | $ / shares	[1]	$ 3.50	$ 2.83	$ 2.12
Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS (in shares) | shares		15	16	22
Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income		$ 6,926	$ 5,610	$ 3,255
Preferred stock dividends and other		(528)	(474)	(253)
Net Income Available to Common Stockholders		$ 6,398	$ 5,136	$ 3,002
Weighted-average common shares outstanding - basic (in shares) | shares		1,818	1,808	1,410
Basic earnings per share (USD per share) | $ / shares		$ 3.52	$ 2.84	$ 2.13
Reallocation of net income available to common stockholders as a result of conversion of nonvoting to voting shares		$ 237	$ 224	$ 41
Allocation of net income available to common stockholders:		$ 6,635	$ 5,360	$ 3,043
Conversion of nonvoting shares to voting shares (in shares) | shares		67	79	19
Common stock equivalent shares related to stock incentive plans (in shares) | shares		9	10	6
Weighted-average common shares outstanding - diluted (in shares) | shares		1,894	1,897	1,435
Diluted earnings per share (USD per share) | $ / shares		$ 3.50	$ 2.83	$ 2.12
Nonvoting Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income		$ 257	$ 245	$ 44
Preferred stock dividends and other		(20)	(21)	(3)
Net Income Available to Common Stockholders		$ 237	$ 224	$ 41
Weighted-average common shares outstanding - basic (in shares) | shares		67	79	19
Basic earnings per share (USD per share) | $ / shares		$ 3.52	$ 2.84	$ 2.13
Reallocation of net income available to common stockholders as a result of conversion of nonvoting to voting shares		$ 0	$ 0	$ 0
Allocation of net income available to common stockholders:		$ 237	$ 224	$ 41
Conversion of nonvoting shares to voting shares (in shares) | shares		0	0	0
Common stock equivalent shares related to stock incentive plans (in shares) | shares		0	0	0
Weighted-average common shares outstanding - diluted (in shares) | shares		67	79	19
Diluted earnings per share (USD per share) | $ / shares		$ 3.50	$ 2.83	$ 2.12

[1] he Company has voting and nonvoting common stock outstanding. As the participation rights, including dividend and liquidation rights, are identical between the voting and nonvoting stock classes, basic and diluted earnings per share are the same for each class. See Notes 19 and 25 for additional information.