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Parent-Only Financial Statements, Parent-Only Statement of Comprehensive Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Net income $ 3,301 $ 19,549 $ 22,393
Other comprehensive income (loss), net of tax:      
Debt securities 1,487 4,193 (3,206)
Derivatives and hedging activities 149 207 (180)
Defined benefit plans adjustments (181) 73 (135)
Other comprehensive income (loss), net of tax 1,506 4,544 (3,676)
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net income 3,301 19,549 22,393
Other comprehensive income (loss), net of tax:      
Debt securities (10) (45) (12)
Derivatives and hedging activities (2) (12) (198)
Defined benefit plans adjustments (178) 75 (132)
Equity in other comprehensive income (loss) of subsidiaries 1,695 4,526 (3,332)
Other comprehensive income (loss), net of tax 1,505 4,544 (3,674)
Wells Fargo comprehensive income $ 4,806 $ 24,093 $ 18,719