Credit Risk Concentrations (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) loan_segment	Dec. 31, 2024 USD ($)
Concentration Risk [Line Items]
Number of portfolio segments | loan_segment	3
Credit exposure	$ 3,415,849	$ 3,038,506
On-balance sheet, Loans	1,493,429	1,347,988
On-balance sheet, Derivatives	57,777	60,967
Off-balance sheet	1,817,307	1,577,622
Available-for-sale securities	507,198	406,852
Held-to-maturity securities	270,134	274,468
Cash placed with banks	$ 333,800	459,200
Apple Credit Card Portfolio
Concentration Risk [Line Items]
Expected period to close	24 months
Obligations of U.S. states and municipalities
Concentration Risk [Line Items]
Trading assets	$ 6,100	6,100
Available-for-sale securities	20,240	17,913
Held-to-maturity securities	8,600	9,310
Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	57,777	60,967
Consumer | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	1,871,408	1,671,825
On-balance sheet, Loans	650,055	625,670
Off-balance sheet	1,221,353	1,046,155
Consumer, excluding credit card
Concentration Risk [Line Items]
On-balance sheet, Loans	402,258	392,810
Consumer, excluding credit card | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	445,845	437,654
On-balance sheet, Loans	402,258	392,810
Off-balance sheet	43,587	44,844
Credit card
Concentration Risk [Line Items]
On-balance sheet, Loans	247,797	232,860
Credit card | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	1,425,563	1,234,171
On-balance sheet, Loans	247,797	232,860
Off-balance sheet	1,177,766	1,001,311
Credit card | Credit Concentration Risk | Apple Credit Card Portfolio
Concentration Risk [Line Items]
Off-balance sheet	104,000
Credit exposure for estimated drawn loans	23,000
Wholesale
Concentration Risk [Line Items]
On-balance sheet, Loans	843,374	722,318
Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	1,544,441	1,366,681
On-balance sheet, Loans	843,374	722,318
Off-balance sheet	595,954	531,467
Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	57,777	60,967
Wholesale | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	1,446,098	1,282,830
On-balance sheet, Loans	792,367	690,396
Off-balance sheet	595,954	531,467
Real Estate | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	477	310
Real Estate | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	224,858	207,050
On-balance sheet, Loans	174,177	169,506
Off-balance sheet	50,204	37,234
Individuals and Individual Entities | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	1,079	1,259
Individuals and Individual Entities | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	167,700	144,145
On-balance sheet, Loans	154,674	130,317
Off-balance sheet	11,947	12,569
Asset Managers | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	14,715	15,695
Asset Managers | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	152,848	135,541
On-balance sheet, Loans	73,660	58,720
Off-balance sheet	64,473	61,126
Consumer & Retail | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	2,235	1,608
Consumer & Retail | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	133,945	129,815
On-balance sheet, Loans	49,113	46,509
Off-balance sheet	82,597	81,698
Technology, Media & Telecommunications | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	1,986	2,448
Technology, Media & Telecommunications | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	97,816	84,716
On-balance sheet, Loans	26,005	21,449
Off-balance sheet	69,825	60,819
Industrials | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	1,146	2,035
Industrials | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	80,606	72,530
On-balance sheet, Loans	26,128	24,011
Off-balance sheet	53,332	46,484
Banks & Finance Companies | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	2,697	3,890
Banks & Finance Companies | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	75,653	61,287
On-balance sheet, Loans	54,841	40,239
Off-balance sheet	18,115	17,158
Healthcare | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	807	616
Healthcare | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	72,218	64,224
On-balance sheet, Loans	21,849	23,243
Off-balance sheet	49,562	40,365
Utilities | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	2,585	2,631
Utilities | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	39,005	35,871
On-balance sheet, Loans	6,565	6,172
Off-balance sheet	29,855	27,068
Oil & Gas | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	524	1,153
Oil & Gas | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	36,497	31,724
On-balance sheet, Loans	8,668	7,226
Off-balance sheet	27,305	23,345
Automotive | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	192	794
Automotive | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	35,984	34,336
On-balance sheet, Loans	17,303	17,696
Off-balance sheet	18,489	15,846
State & Municipal Govt | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	523	372
State & Municipal Govt | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	32,484	35,039
On-balance sheet, Loans	16,931	19,279
Off-balance sheet	15,030	15,388
Insurance | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	8,532	9,703
Insurance | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	25,031	24,267
On-balance sheet, Loans	3,202	2,533
Off-balance sheet	13,297	12,031
Chemicals & Plastics | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	350	267
Chemicals & Plastics | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	23,790	20,782
On-balance sheet, Loans	6,479	6,176
Off-balance sheet	16,961	14,339
Transportation | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	1,027	769
Transportation | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	20,861	17,019
On-balance sheet, Loans	5,693	5,380
Off-balance sheet	14,141	10,870
Metals & Mining | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	1,587	564
Metals & Mining | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	17,767	15,860
On-balance sheet, Loans	4,828	4,425
Off-balance sheet	11,352	10,871
Central Govt | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	4,514	6,285
Central Govt | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	15,164	13,862
On-balance sheet, Loans	6,474	4,715
Off-balance sheet	4,176	2,862
Securities Firms | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	3,051	3,197
Securities Firms | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	7,966	9,443
On-balance sheet, Loans	1,115	1,878
Off-balance sheet	3,800	4,368
Financial Markets Infrastructure | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	3,543	2,410
Financial Markets Infrastructure | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	5,734	4,446
On-balance sheet, Loans	66	16
Off-balance sheet	2,125	2,020
All other | Credit Concentration Risk
Concentration Risk [Line Items]
On-balance sheet, Derivatives	6,207	4,961
All other | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	180,171	140,873
On-balance sheet, Loans	134,596	100,906
Off-balance sheet	$ 39,368	$ 35,006
All other | Wholesale | Credit Concentration Risk | SPEs and Private education
Concentration Risk [Line Items]
Percentage of exposure secured	95.00%	94.00%
All other | Wholesale | Credit Concentration Risk | Civic organizations
Concentration Risk [Line Items]
Percentage of exposure secured	5.00%	6.00%
Loans held-for-sale and loans at fair value | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	$ 51,007	$ 31,922
On-balance sheet, Loans	51,007	31,922
Receivables from customers | Wholesale | Credit Concentration Risk
Concentration Risk [Line Items]
Credit exposure	$ 47,336	$ 51,929