Derivative Instruments - Derivatives Netting (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	$ 627,007	$ 531,221
Amounts netted on the Consolidated balance sheets	(581,175)	(484,384)
Net derivative receivables	45,832	46,837
Derivative receivables where an appropriate legal opinion has not been either sought or obtained	6,729	8,027
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	633,736	539,248
Total derivative receivables	52,561	54,864
Collateral not nettable on the Consolidated balance sheets	(23,082)	(22,461)
Net amounts	29,479	32,403
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	625,370	537,679
Amounts netted on the Consolidated balance sheets	(595,220)	(506,125)
Net derivative payables	30,150	31,554
Derivative payables where an appropriate legal opinion has not been either sought or obtained	8,515	9,293
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	633,885	546,972
Total derivative payables	38,665	40,847
Collateral not nettable on the Consolidated balance sheets	(9,522)	(4,547)
Net amounts	29,143	36,300
Net cash collateral receivables	44,700	48,300
Net cash collateral payables	58,800	70,000
Interest rate contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	304,582	248,722
Amounts netted on the Consolidated balance sheets	(282,118)	(224,367)
Net derivative receivables	22,464	24,355
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	306,252	250,691
Total derivative receivables	24,134	26,324
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	287,785	238,344
Amounts netted on the Consolidated balance sheets	(280,237)	(228,586)
Net derivative payables	7,548	9,758
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	288,845	240,482
Total derivative payables	8,608	11,896
Interest rate contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	166,047	176,901
Amounts netted on the Consolidated balance sheets	(143,724)	(152,703)
Net derivative receivables	22,323	24,198
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	144,408	161,901
Amounts netted on the Consolidated balance sheets	(137,394)	(152,467)
Net derivative payables	7,014	9,434
Interest rate contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	138,294	71,419
Amounts netted on the Consolidated balance sheets	(138,158)	(71,275)
Net derivative receivables	136	144
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	142,941	76,007
Amounts netted on the Consolidated balance sheets	(142,409)	(75,729)
Net derivative payables	532	278
Interest rate contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	241	402
Amounts netted on the Consolidated balance sheets	(236)	(389)
Net derivative receivables	5	13
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	436	436
Amounts netted on the Consolidated balance sheets	(434)	(390)
Net derivative payables	2	46
Net credit derivatives
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	10,419	9,541
Amounts netted on the Consolidated balance sheets	(9,913)	(9,103)
Net derivative receivables	506	438
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	10,522	9,654
Total derivative receivables	609	551
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	13,753	11,971
Amounts netted on the Consolidated balance sheets	(12,247)	(10,949)
Net derivative payables	1,506	1,022
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	13,973	12,038
Total derivative payables	1,726	1,089
Net credit derivatives | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	7,735	7,637
Amounts netted on the Consolidated balance sheets	(7,393)	(7,226)
Net derivative receivables	342	411
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	11,419	10,332
Amounts netted on the Consolidated balance sheets	(10,083)	(9,313)
Net derivative payables	1,336	1,019
Net credit derivatives | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	2,684	1,904
Amounts netted on the Consolidated balance sheets	(2,520)	(1,877)
Net derivative receivables	164	27
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	2,334	1,639
Amounts netted on the Consolidated balance sheets	(2,164)	(1,636)
Net derivative payables	170	3
Foreign exchange contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	194,828	204,099
Amounts netted on the Consolidated balance sheets	(179,484)	(187,756)
Net derivative receivables	15,344	16,343
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	196,473	205,775
Total derivative receivables	16,989	18,019
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	197,698	209,944
Amounts netted on the Consolidated balance sheets	(187,348)	(199,643)
Net derivative payables	10,350	10,301
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	199,996	212,263
Total derivative payables	12,648	12,620
Foreign exchange contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	194,493	203,624
Amounts netted on the Consolidated balance sheets	(179,201)	(187,295)
Net derivative receivables	15,292	16,329
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	197,375	209,386
Amounts netted on the Consolidated balance sheets	(187,064)	(199,173)
Net derivative payables	10,311	10,213
Foreign exchange contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	314	469
Amounts netted on the Consolidated balance sheets	(283)	(459)
Net derivative receivables	31	10
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	306	552
Amounts netted on the Consolidated balance sheets	(284)	(470)
Net derivative payables	22	82
Foreign exchange contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	21	6
Amounts netted on the Consolidated balance sheets	0	(2)
Net derivative receivables	21	4
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	17	6
Amounts netted on the Consolidated balance sheets	0	0
Net derivative payables	17	6
Equity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	97,731	55,463
Amounts netted on the Consolidated balance sheets	(93,494)	(52,761)
Net derivative receivables	4,237	2,702
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	98,845	57,689
Total derivative receivables	5,351	4,928
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	109,306	63,136
Amounts netted on the Consolidated balance sheets	(101,049)	(56,443)
Net derivative payables	8,257	6,693
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	111,659	65,811
Total derivative payables	10,610	9,368
Equity contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	38,268	25,001
Amounts netted on the Consolidated balance sheets	(35,837)	(23,677)
Net derivative receivables	2,431	1,324
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	51,106	29,999
Amounts netted on the Consolidated balance sheets	(43,393)	(27,360)
Net derivative payables	7,713	2,639
Equity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	59,463	30,462
Amounts netted on the Consolidated balance sheets	(57,657)	(29,084)
Net derivative receivables	1,806	1,378
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	58,200	33,137
Amounts netted on the Consolidated balance sheets	(57,656)	(29,083)
Net derivative payables	544	4,054
Commodity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	19,447	13,396
Amounts netted on the Consolidated balance sheets	(16,166)	(10,397)
Net derivative receivables	3,281	2,999
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	21,644	15,439
Total derivative receivables	5,478	5,042
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	16,828	14,284
Amounts netted on the Consolidated balance sheets	(14,339)	(10,504)
Net derivative payables	2,489	3,780
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	19,412	16,378
Total derivative payables	5,073	5,874
Commodity contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	11,045	8,049
Amounts netted on the Consolidated balance sheets	(8,206)	(5,084)
Net derivative receivables	2,839	2,965
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	9,066	8,788
Amounts netted on the Consolidated balance sheets	(6,577)	(5,192)
Net derivative payables	2,489	3,596
Commodity contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	106	133
Amounts netted on the Consolidated balance sheets	(80)	(123)
Net derivative receivables	26	10
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	80	120
Amounts netted on the Consolidated balance sheets	(80)	(120)
Net derivative payables	0	0
Commodity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	8,296	5,214
Amounts netted on the Consolidated balance sheets	(7,880)	(5,190)
Net derivative receivables	416	24
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	7,682	5,376
Amounts netted on the Consolidated balance sheets	(7,682)	(5,192)
Net derivative payables	$ 0	$ 184