Fair Value Measurement - Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	$ 668,835	$ 606,382
Derivative netting adjustments	(597,251)	(548,605)
Total derivative receivables	71,584	57,777
Total trading assets	1,069,335	802,873
Available-for-sale securities	549,037	507,198
Loans	62,255	70,684
Mortgage servicing rights	9,093	9,167	$ 9,127	$ 9,121
Gross derivative payables	651,332	596,738
Derivative netting adjustments	(600,042)	(550,409)
Total derivative payables	51,290	46,329
Interest rate
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	287,095	281,884
Derivative netting adjustments	(261,318)	(256,483)
Total derivative receivables	25,777	25,401
Gross derivative payables	263,346	257,583
Derivative netting adjustments	(254,756)	(250,122)
Total derivative payables	8,590	7,461
Credit
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	15,529	13,024
Derivative netting adjustments	(13,941)	(12,545)
Total derivative receivables	1,588	479
Gross derivative payables	18,733	17,628
Derivative netting adjustments	(16,755)	(15,612)
Total derivative payables	1,978	2,016
Foreign exchange
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	213,833	183,236
Derivative netting adjustments	(189,883)	(163,881)
Total derivative receivables	23,950	19,355
Gross derivative payables	206,743	178,141
Derivative netting adjustments	(190,941)	(163,308)
Total derivative payables	15,802	14,833
Equity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	112,357	97,723
Derivative netting adjustments	(102,952)	(91,856)
Total derivative receivables	9,405	5,867
Gross derivative payables	126,691	117,017
Derivative netting adjustments	(110,324)	(102,211)
Total derivative payables	16,367	14,806
Commodity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	40,021	30,515
Derivative netting adjustments	(29,157)	(23,840)
Total derivative receivables	10,864	6,675
Gross derivative payables	35,819	26,369
Derivative netting adjustments	(27,266)	(19,156)
Total derivative payables	8,553	7,213
Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	96,683	101,447
Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	4,317	4,484
U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	356,258	315,822
Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	18,980	20,240
Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	53,211	45,655
Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	124	128
Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	23,781
Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	21,995	21,947
Fair Value Measured at Net Asset Value Per Share
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value	1,000	1,000
Recurring
Assets and liabilities measured at fair value on a recurring basis
Federal funds sold and securities purchased under resale agreements	472,506	327,018
Securities borrowed	105,987	98,111
Total debt and equity instruments	997,751	745,096
Derivative netting adjustments	(597,251)	(548,605)
Total derivative receivables	71,584	57,777
Total trading assets	1,069,335	802,873
Available-for-sale securities	549,037	507,198
Loans	62,255	70,684
Mortgage servicing rights	9,093	9,167
Other assets	20,264	14,801
Total assets measured at fair value	2,288,477	1,829,852
Deposits	19,803	20,930
Federal funds purchased and securities loaned or sold under repurchase agreements	620,136	360,194
Short-term borrowings	28,937	32,460
Trading liabilities, debt and equity instruments	196,546	169,690
Derivative netting adjustments	(600,042)	(550,409)
Total derivative payables	51,290	46,329
Total trading liabilities	247,836	216,019
Accounts payable and other liabilities	10,738	6,660
Beneficial interests issued by consolidated VIEs	5	5
Long-term debt	144,704	134,559
Total liabilities measured at fair value	1,072,159	770,827
Recurring | Interest rate
Assets and liabilities measured at fair value on a recurring basis
Derivative netting adjustments	(261,318)	(256,483)
Total derivative receivables	25,777	25,401
Derivative netting adjustments	(254,756)	(250,122)
Total derivative payables	8,590	7,461
Recurring | Credit
Assets and liabilities measured at fair value on a recurring basis
Derivative netting adjustments	(13,941)	(12,545)
Total derivative receivables	1,588	479
Derivative netting adjustments	(16,755)	(15,612)
Total derivative payables	1,978	2,016
Recurring | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis
Derivative netting adjustments	(189,883)	(163,881)
Total derivative receivables	23,950	19,355
Derivative netting adjustments	(190,941)	(163,308)
Total derivative payables	15,802	14,833
Recurring | Equity
Assets and liabilities measured at fair value on a recurring basis
Derivative netting adjustments	(102,952)	(91,856)
Total derivative receivables	9,405	5,867
Derivative netting adjustments	(110,324)	(102,211)
Total derivative payables	16,367	14,806
Recurring | Commodity
Assets and liabilities measured at fair value on a recurring basis
Derivative netting adjustments	(29,157)	(23,840)
Total derivative receivables	10,864	6,675
Derivative netting adjustments	(27,266)	(19,156)
Total derivative payables	8,553	7,213
Recurring | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	734,895	600,573
Recurring | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	166,786	162,085
Available-for-sale securities	96,683	101,447
Recurring | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	158,651	158,141
Available-for-sale securities	86,899	90,972
Recurring | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	6,486	2,007
Available-for-sale securities	5,467	5,991
Recurring | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	1,649	1,937
Available-for-sale securities	4,317	4,484
Recurring | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	308,183	243,884
Available-for-sale securities	356,258	315,822
Recurring | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	6,388	6,130
Available-for-sale securities	18,980	20,240
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	4,685	1,345
Recurring | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	179,839	124,684
Available-for-sale securities	53,211	45,655
Recurring | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	52,262	45,507
Available-for-sale securities	124	128
Recurring | Loans
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	13,388	12,925
Recurring | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	3,364	4,013
Recurring | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	236,327	109,876
Recurring | Physical commodities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	15,275	21,857
Recurring | Other
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	11,254	12,790
Recurring | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	21,995	21,947
Recurring | Asset-backed securities, Other
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	1,786	1,959
Recurring | U.S. GSE obligations
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	169,200	158,400
Recurring | Level 1
Assets and liabilities measured at fair value on a recurring basis
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Total debt and equity instruments	649,234	431,105
Gross derivative receivables	8,691	2,496
Total trading assets	657,925	433,601
Available-for-sale securities	395,210	349,670
Loans	0	0
Mortgage servicing rights	0	0
Other assets	8,494	6,864
Total assets measured at fair value	1,061,629	790,135
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Short-term borrowings	0	0
Trading liabilities, debt and equity instruments	152,659	135,366
Gross derivative payables	6,021	3,399
Total trading liabilities	158,680	138,765
Accounts payable and other liabilities	5,061	3,967
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	0	0
Total liabilities measured at fair value	163,741	142,732
Recurring | Level 1 | Interest rate
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	4,788	1,579
Gross derivative payables	3,303	2,071
Recurring | Level 1 | Credit
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	0	0
Gross derivative payables	0	0
Recurring | Level 1 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	339	111
Gross derivative payables	329	118
Recurring | Level 1 | Equity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	3,564	806
Gross derivative payables	2,389	1,210
Recurring | Level 1 | Commodity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	0	0
Gross derivative payables	0	0
Recurring | Level 1 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	400,810	302,640
Recurring | Level 1 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	16	1
Recurring | Level 1 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	16	1
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	288,401	225,255
Available-for-sale securities	355,307	315,361
Recurring | Level 1 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Recurring | Level 1 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	112,409	77,385
Available-for-sale securities	39,887	34,308
Recurring | Level 1 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	0
Recurring | Level 1 | Loans
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Recurring | Level 1 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Recurring | Level 1 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	234,003	107,585
Recurring | Level 1 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	14,421	20,880
Recurring | Level 1 | Other
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Recurring | Level 1 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	0	0
Recurring | Level 1 | Asset-backed securities, Other
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	0	0
Recurring | Level 2
Assets and liabilities measured at fair value on a recurring basis
Federal funds sold and securities purchased under resale agreements	472,506	327,018
Securities borrowed	105,987	98,111
Total debt and equity instruments	345,811	311,197
Gross derivative receivables	648,263	594,960
Total trading assets	994,074	906,157
Available-for-sale securities	153,719	157,417
Loans	59,071	67,622
Mortgage servicing rights	0	0
Other assets	10,699	6,890
Total assets measured at fair value	1,796,056	1,563,215
Deposits	18,499	18,574
Federal funds purchased and securities loaned or sold under repurchase agreements	620,136	360,194
Short-term borrowings	23,070	26,902
Trading liabilities, debt and equity instruments	43,552	33,998
Gross derivative payables	632,797	581,336
Total trading liabilities	676,349	615,334
Accounts payable and other liabilities	5,630	2,655
Beneficial interests issued by consolidated VIEs	5	5
Long-term debt	95,532	87,886
Total liabilities measured at fair value	1,439,221	1,111,550
Recurring | Level 2 | Interest rate
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	277,839	276,565
Gross derivative payables	257,304	253,078
Recurring | Level 2 | Credit
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	13,207	12,018
Gross derivative payables	16,471	15,487
Recurring | Level 2 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	211,575	181,318
Gross derivative payables	205,067	176,521
Recurring | Level 2 | Equity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	106,374	95,098
Gross derivative payables	118,744	110,451
Recurring | Level 2 | Commodity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	39,268	29,961
Gross derivative payables	35,211	25,799
Recurring | Level 2 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	332,016	295,751
Recurring | Level 2 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	166,513	161,773
Available-for-sale securities	96,667	101,443
Recurring | Level 2 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	158,383	157,834
Available-for-sale securities	86,883	90,971
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	6,481	2,002
Available-for-sale securities	5,467	5,991
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	1,649	1,937
Available-for-sale securities	4,317	4,481
Recurring | Level 2 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	19,782	18,629
Available-for-sale securities	951	461
Recurring | Level 2 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	6,358	6,129
Available-for-sale securities	18,980	20,240
Recurring | Level 2 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	4,685	1,345
Recurring | Level 2 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	67,223	47,054
Available-for-sale securities	13,324	11,347
Recurring | Level 2 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	51,780	45,053
Available-for-sale securities	16	20
Recurring | Level 2 | Loans
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	12,337	11,782
Recurring | Level 2 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	3,338	3,986
Recurring | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	2,152	2,153
Recurring | Level 2 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	843	947
Recurring | Level 2 | Other
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	10,800	12,346
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	21,995	21,947
Recurring | Level 2 | Asset-backed securities, Other
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	1,786	1,959
Recurring | Level 3
Assets and liabilities measured at fair value on a recurring basis
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Total debt and equity instruments	2,706	2,794
Gross derivative receivables	11,881	8,926
Total trading assets	14,587	11,720
Available-for-sale securities	108	111
Loans	3,184	3,062
Mortgage servicing rights	9,093	9,167
Other assets	1,071	1,047
Total assets measured at fair value	28,043	25,107
Deposits	1,304	2,356
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Short-term borrowings	5,867	5,558
Trading liabilities, debt and equity instruments	335	326
Gross derivative payables	12,514	12,003
Total trading liabilities	12,849	12,329
Accounts payable and other liabilities	47	38
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	49,172	46,673
Total liabilities measured at fair value	69,239	66,954
Recurring | Level 3 | Interest rate
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	4,468	3,740
Gross derivative payables	2,739	2,434
Recurring | Level 3 | Credit
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	2,322	1,006
Gross derivative payables	2,262	2,141
Recurring | Level 3 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	1,919	1,807
Gross derivative payables	1,347	1,502
Recurring | Level 3 | Equity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	2,419	1,819
Gross derivative payables	5,558	5,356
Recurring | Level 3 | Commodity
Assets and liabilities measured at fair value on a recurring basis
Gross derivative receivables	753	554
Gross derivative payables	608	570
Recurring | Level 3 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	2,069	2,182
Recurring | Level 3 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	273	312
Available-for-sale securities	0	3
Recurring | Level 3 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	268	307
Available-for-sale securities	0	0
Recurring | Level 3 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	5	5
Available-for-sale securities	0	0
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	3
Recurring | Level 3 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Available-for-sale securities	0	0
Recurring | Level 3 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	30	1
Available-for-sale securities	0	0
Recurring | Level 3 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	0	0
Recurring | Level 3 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	207	245
Available-for-sale securities	0	0
Recurring | Level 3 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	482	454
Available-for-sale securities	108	108
Recurring | Level 3 | Loans
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	1,051	1,143
Recurring | Level 3 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	26	27
Recurring | Level 3 | Equity securities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	172	138
Recurring | Level 3 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	11	30
Recurring | Level 3 | Other
Assets and liabilities measured at fair value on a recurring basis
Total debt and equity instruments	454	444
Recurring | Level 3 | Asset-backed securities, Collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	0	0
Recurring | Level 3 | Asset-backed securities, Other
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale securities	$ 0	$ 0