v3.26.1
Equity Securities (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Equity Securities [Line Items]    
Total equity securities not held for trading $ 42,378 $ 40,932
Not held for trading [Member]    
Equity Securities [Line Items]    
Equity securities at fair value 2,394 2,008
Equity Securities Textual [Abstract]    
Contractual lock-up period restriction for sale 467 218
Federal reserve bank stock 3,500 3,500
Federal home loan bank stock 1,000 762
Not held for trading [Member] | Tax credit investments [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value 21,707 21,395
Not held for trading [Member] | Affordable housing tax credit investments [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value 11,200 11,600
Not held for trading [Member] | Renewable energy tax credit investments [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value 10,300 9,600
Not held for trading [Member] | Renewable energy tax credit investments [Member] | Accounting method, investment tax credit, deferral    
Equity Securities Textual [Abstract]    
Deferred investment tax credit (1,600) (1,700)
Not held for trading [Member] | Private equity [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value 13,656 13,206
Not held for trading [Member] | Federal Reserve Bank stock and other at cost [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value 4,621 4,323
Not held for trading [Member] | Other method investments - Private equity [Member]    
Equity Securities [Line Items]    
Equity securities, not carried at fair value $ 10,100 $ 9,800