Equity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Equity Securities [Line Items]
Equity securities, carried at fair value	$ 22,361	$ 19,841
Equity securities	59,771	57,336
Equity Securities Textual [Abstract]
Federal Reserve Bank Stock	3,500	3,500
Federal Home Loan Bank Stock	358	1,700
Held for trading at fair value [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	20,351	18,449
Not held for trading [Member]
Equity Securities [Line Items]
Equity securities, carried at fair value	2,010	1,392
Equity securities	39,420	38,887
Not held for trading [Member] | Tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	21,241	20,016
Not held for trading [Member] | Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	12,253	12,203
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	3,916	5,276
Not held for trading [Member] | Affordable housing tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	12,400	12,900
Not held for trading [Member] | Renewable energy tax credit investments [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	8,500	6,800
Not held for trading [Member] | Other method investments - Private equity [Member]
Equity Securities [Line Items]
Equity securities, not carried at fair value	$ 9,100	$ 9,100