Derivative Instruments - Derivatives Netting (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	$ 552,446	$ 681,647
Amounts netted on the Consolidated balance sheets	(503,293)	(627,924)
Net derivative receivables	49,153	53,723
Derivative receivables where an appropriate legal opinion has not been either sought or obtained	21,558	25,907
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	574,004	707,554
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	70,711	79,630
Collateral not nettable on the Consolidated balance sheets	(11,324)	(14,806)
Net amounts	59,387	64,824
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	533,385	665,950
Amounts netted on the Consolidated balance sheets	(496,836)	(618,264)
Net derivative payables	36,549	47,686
Derivative payables where an appropriate legal opinion has not been either sought or obtained	19,496	22,937
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	552,881	688,887
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	56,045	70,623
Collateral not nettable on the Consolidated balance sheets	(7,873)	(11,964)
Net amounts	48,172	58,659
Net cash collateral receivables	70,000	88,000
Net cash collateral payables	63,500	78,400
Interest rate contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	299,599	386,108
Amounts netted on the Consolidated balance sheets	(278,203)	(355,923)
Net derivative receivables	21,396	30,185
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	304,249	391,648
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	26,046	35,725
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	268,843	352,282
Amounts netted on the Consolidated balance sheets	(260,985)	(340,975)
Net derivative payables	7,858	11,307
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	270,175	353,987
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	9,190	13,012
Interest rate contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	281,104	367,214
Amounts netted on the Consolidated balance sheets	(259,955)	(337,609)
Net derivative receivables	21,149	29,605
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	248,575	332,214
Amounts netted on the Consolidated balance sheets	(241,070)	(321,140)
Net derivative payables	7,505	11,074
Interest rate contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	18,220	18,340
Amounts netted on the Consolidated balance sheets	(17,997)	(17,919)
Net derivative receivables	223	421
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	20,066	19,710
Amounts netted on the Consolidated balance sheets	(19,739)	(19,494)
Net derivative payables	327	216
Interest rate contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	275	554
Amounts netted on the Consolidated balance sheets	(251)	(395)
Net derivative receivables	24	159
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	202	358
Amounts netted on the Consolidated balance sheets	(176)	(341)
Net derivative payables	26	17
Net credit derivatives
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	9,893	13,220
Amounts netted on the Consolidated balance sheets	(9,156)	(12,665)
Net derivative receivables	737	555
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	10,104	13,345
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	948	680
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	10,951	14,386
Amounts netted on the Consolidated balance sheets	(10,331)	(12,837)
Net derivative payables	620	1,549
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	11,515	14,832
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	1,184	1,995
Net credit derivatives | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	7,860	8,894
Amounts netted on the Consolidated balance sheets	(7,134)	(8,356)
Net derivative receivables	726	538
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	9,117	10,311
Amounts netted on the Consolidated balance sheets	(8,516)	(8,781)
Net derivative payables	601	1,530
Net credit derivatives | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	2,033	4,326
Amounts netted on the Consolidated balance sheets	(2,022)	(4,309)
Net derivative receivables	11	17
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	1,834	4,075
Amounts netted on the Consolidated balance sheets	(1,815)	(4,056)
Net derivative payables	19	19
Foreign exchange contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	154,114	202,218
Amounts netted on the Consolidated balance sheets	(142,910)	(190,479)
Net derivative receivables	11,204	11,739
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	157,417	206,260
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	14,507	15,781
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	153,133	211,673
Amounts netted on the Consolidated balance sheets	(143,036)	(194,493)
Net derivative payables	10,097	17,180
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	156,751	215,926
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	13,715	21,433
Foreign exchange contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	153,517	201,349
Amounts netted on the Consolidated balance sheets	(142,403)	(189,655)
Net derivative receivables	11,114	11,694
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	152,578	210,803
Amounts netted on the Consolidated balance sheets	(142,529)	(193,672)
Net derivative payables	10,049	17,131
Foreign exchange contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	574	834
Amounts netted on the Consolidated balance sheets	(507)	(819)
Net derivative receivables	67	15
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	533	836
Amounts netted on the Consolidated balance sheets	(507)	(819)
Net derivative payables	26	17
Foreign exchange contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	23	35
Amounts netted on the Consolidated balance sheets	0	(5)
Net derivative receivables	23	30
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	22	34
Amounts netted on the Consolidated balance sheets	0	(2)
Net derivative payables	22	32
Equity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	63,085	62,324
Amounts netted on the Consolidated balance sheets	(56,243)	(54,125)
Net derivative receivables	6,842	8,199
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	73,104	74,798
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	16,861	20,673
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	75,236	69,821
Amounts netted on the Consolidated balance sheets	(63,457)	(55,515)
Net derivative payables	11,779	14,306
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	84,557	81,413
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	21,100	25,898
Equity contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	29,092	34,030
Amounts netted on the Consolidated balance sheets	(22,796)	(27,374)
Net derivative receivables	6,296	6,656
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	34,459	35,330
Amounts netted on the Consolidated balance sheets	(30,011)	(28,763)
Net derivative payables	4,448	6,567
Equity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	33,993	28,294
Amounts netted on the Consolidated balance sheets	(33,447)	(26,751)
Net derivative receivables	546	1,543
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	40,777	34,491
Amounts netted on the Consolidated balance sheets	(33,446)	(26,752)
Net derivative payables	7,331	7,739
Commodity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	25,755	17,777
Amounts netted on the Consolidated balance sheets	(16,781)	(14,732)
Net derivative receivables	8,974	3,045
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	29,130	21,503
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	12,349	6,771
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	25,222	17,788
Amounts netted on the Consolidated balance sheets	(19,027)	(14,444)
Net derivative payables	6,195	3,344
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	29,883	22,729
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	10,856	8,285
Commodity contracts | Over-the-counter (“OTC”)
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	15,720	10,924
Amounts netted on the Consolidated balance sheets	(6,911)	(7,901)
Net derivative receivables	8,809	3,023
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	14,621	10,365
Amounts netted on the Consolidated balance sheets	(9,066)	(7,544)
Net derivative payables	5,555	2,821
Commodity contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	65	20
Amounts netted on the Consolidated balance sheets	(65)	(20)
Net derivative receivables	0	0
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	80	32
Amounts netted on the Consolidated balance sheets	(80)	(32)
Net derivative payables	0	0
Commodity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	9,970	6,833
Amounts netted on the Consolidated balance sheets	(9,805)	(6,811)
Net derivative receivables	165	22
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	10,521	7,391
Amounts netted on the Consolidated balance sheets	(9,881)	(6,868)
Net derivative payables	$ 640	$ 523