Revenue and Expenses, Revenue by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	$ 12,317	$ 11,708	$ 24,413	$ 23,203
Lending-related fees	405	373	798	737
Other card fees	175	137	345	262
Total card fees	1,222	1,173	2,360	2,217
Mortgage banking	256	230	457	562
Net gains (losses) from trading activities	1,393	1,376	2,744	2,760
Net gains (losses) from debt securities	1	0	1	(147)
Net gains (losses) from equity securities	847	119	1,019	(224)
Other	377	789	866	1,591
Total noninterest income	10,305	9,114	19,655	17,768
Total revenue	22,622	20,822	44,068	40,971
Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	1,357	1,249	2,676	2,518
Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	2,821	2,499	5,645	5,035
Trailing commissions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	243	222	487	455
Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	687	610	1,354	1,248
Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	939	696	1,735	1,471
Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	1,047	1,036	2,015	1,955
Credit card rewards and rebates [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other cost of revenue	878	737	1,700	1,400
Corporate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	(589)	(103)	(1,049)	(67)
Lending-related fees	0	0	0	0
Other card fees	0	0	0	1
Total card fees	0	1	2	3
Mortgage banking	1	0	1	0
Net gains (losses) from trading activities	59	14	8	13
Net gains (losses) from debt securities	(1)	0	(2)	(149)
Net gains (losses) from equity securities	808	73	915	(277)
Other	164	605	399	908
Total noninterest income	1,002	662	1,230	449
Total revenue	413	559	181	382
Corporate [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	1	0	0	1
Corporate [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Corporate [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	(1)	0
Corporate [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	(30)	(31)	(92)	(50)
Corporate [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	1	2	2
Reconciling Items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	(75)	(77)	(147)	(154)
Lending-related fees	0	0	0	0
Other card fees	0	0	0	0
Total card fees	0	0	0	0
Mortgage banking	0	0	0	0
Net gains (losses) from trading activities	0	0	0	0
Net gains (losses) from debt securities	0	0	0	0
Net gains (losses) from equity securities	0	0	0	0
Other	(439)	(392)	(960)	(765)
Total noninterest income	(439)	(392)	(960)	(765)
Total revenue	(514)	(469)	(1,107)	(919)
Reconciling Items [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Reconciling Items [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Reconciling Items [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Reconciling Items [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Reconciling Items [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Consumer Banking and Lending [Member] \| Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	7,742	7,305	15,293	14,344
Lending-related fees	23	15	45	31
Other card fees	175	137	345	261
Total card fees	1,148	1,109	2,212	2,087
Mortgage banking	154	169	317	391
Net gains (losses) from trading activities	(1)	0	(1)	0
Net gains (losses) from debt securities	0	0	0	0
Net gains (losses) from equity securities	0	12	0	5
Other	87	83	187	214
Total noninterest income	2,546	2,383	4,993	4,727
Total revenue	10,288	9,688	20,286	19,071
Consumer Banking and Lending [Member] \| Operating Segments [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	747	653	1,467	1,304
Consumer Banking and Lending [Member] \| Operating Segments [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	264	232	528	472
Consumer Banking and Lending [Member] \| Operating Segments [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	127	111	242	224
Consumer Banking and Lending [Member] \| Operating Segments [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	(3)	(1)	(4)	(1)
Consumer Banking and Lending [Member] \| Operating Segments [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	973	972	1,867	1,826
Commercial Banking [Member] \| Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	2,047	1,983	4,035	3,960
Lending-related fees	148	138	298	274
Other card fees	0	0	0	0
Total card fees	58	49	113	98
Mortgage banking	0	0	0	0
Net gains (losses) from trading activities	0	0	0	0
Net gains (losses) from debt securities	2	0	3	2
Net gains (losses) from equity securities	37	3	88	(2)
Other	462	388	985	769
Total noninterest income	1,071	950	2,203	1,898
Total revenue	3,118	2,933	6,238	5,858
Commercial Banking [Member] \| Operating Segments [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	325	324	644	659
Commercial Banking [Member] \| Operating Segments [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	15	20	33	41
Commercial Banking [Member] \| Operating Segments [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Commercial Banking [Member] \| Operating Segments [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	24	28	39	57
Commercial Banking [Member] \| Operating Segments [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	58	49	113	98
Corporate and Investment Banking [Member] \| Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	2,273	1,815	4,457	3,605
Lending-related fees	229	209	446	410
Other card fees	0	0	0	0
Total card fees	15	13	31	27
Mortgage banking	104	64	145	178
Net gains (losses) from trading activities	1,309	1,335	2,691	2,693
Net gains (losses) from debt securities	0	0	0	0
Net gains (losses) from equity securities	2	31	16	62
Other	109	102	261	473
Total noninterest income	3,152	2,858	6,246	6,132
Total revenue	5,425	4,673	10,703	9,737
Corporate and Investment Banking [Member] \| Operating Segments [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	277	266	551	541
Corporate and Investment Banking [Member] \| Operating Segments [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	36	39	75	80
Corporate and Investment Banking [Member] \| Operating Segments [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	123	99	238	203
Corporate and Investment Banking [Member] \| Operating Segments [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	948	700	1,792	1,465
Corporate and Investment Banking [Member] \| Operating Segments [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	15	13	31	27
Wealth and Investment Management [Member] \| Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest income (expense)	919	785	1,824	1,515
Lending-related fees	5	11	9	22
Other card fees	0	0	0	0
Total card fees	1	1	2	2
Mortgage banking	(3)	(3)	(6)	(7)
Net gains (losses) from trading activities	26	27	46	54
Net gains (losses) from debt securities	0	0	0	0
Net gains (losses) from equity securities	0	0	0	(12)
Other	(6)	3	(6)	(8)
Total noninterest income	2,973	2,653	5,943	5,327
Total revenue	3,892	3,438	7,767	6,842
Wealth and Investment Management [Member] \| Operating Segments [Member] \| Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	7	6	14	13
Wealth and Investment Management [Member] \| Operating Segments [Member] \| Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	2,506	2,208	5,009	4,442
Wealth and Investment Management [Member] \| Operating Segments [Member] \| Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	437	400	875	821
Wealth and Investment Management [Member] \| Operating Segments [Member] \| Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0	0	0
Wealth and Investment Management [Member] \| Operating Segments [Member] \| Interchange and merchant services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	$ 1	$ 1	$ 2	$ 2

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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