Earnings Per Common Share, Calculation of Earnings and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020
Earnings Per Common Share [Abstract]
Wells Fargo net income (loss)	$ 5,122	$ 3,216	[1]	$ 15,798	$ 286	[1]
Less: Preferred stock dividends and other	335	315		1,012	1,241
Wells Fargo net income (loss) applicable to common stock (numerator)	$ 4,787	$ 2,901	[1]	$ 14,786	$ (955)	[1]
Earnings per common share
Average common shares outstanding (denominator) (in shares)	4,056.3	4,123.8	[1]	4,107.1	4,111.4	[1]
Per share (in dollars per share)	$ 1.18	$ 0.70	[1]	$ 3.60	$ (0.23)	[1]
Diluted earnings per common share
Average common shares outstanding (in shares)	4,056.3	4,123.8	[1]	4,107.1	4,111.4	[1]
Diluted average common shares outstanding (denominator) (in shares)	4,090.4	4,132.2	[1]	4,140.0	4,111.4	[1]
Per share (in dollars per share)	$ 1.17	$ 0.70	[1]	$ 3.57	$ (0.23)	[1]
Preferred Stock, Accretion Of Redemption Discount Or Issuance Costs	$ 38			$ 86	$ 272
Weighted Average Number of Shares, Restricted Stock					53.4
Restricted share rights [Member]
Diluted earnings per common share
Weighted average number of diluted shares outstanding, adjustment (in shares)	34.1	8.4		32.9	0.0

[1] In second quarter 2021, we elected to change our accounting method for low-income housing tax credit investments and elected to change the presentation of investment tax credits related to solar energy investments. Prior period balances have been revised to conform with the current period presentation. For additional information, see Note 1 (Summary of Significant Accounting Policies).