Derivative Instruments - Impact on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Gross derivative receivables	$ 633,736	$ 539,248
Net derivative receivables	52,561	54,864
Gross derivative payables	633,885	546,972
Net derivative payables	38,665	40,847
Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	306,252	250,691
Net derivative receivables	24,134	26,324
Gross derivative payables	288,845	240,482
Net derivative payables	8,608	11,896
Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	10,522	9,654
Net derivative receivables	609	551
Gross derivative payables	13,973	12,038
Net derivative payables	1,726	1,089
Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	196,473	205,775
Net derivative receivables	16,989	18,019
Gross derivative payables	199,996	212,263
Net derivative payables	12,648	12,620
Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	98,845	57,689
Net derivative receivables	5,351	4,928
Gross derivative payables	111,659	65,811
Net derivative payables	10,610	9,368
Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	21,644	15,439
Net derivative receivables	5,478	5,042
Gross derivative payables	19,412	16,378
Net derivative payables	5,073	5,874
Not designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	633,155	538,270
Gross derivative payables	631,919	545,240
Not designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	306,252	250,689
Gross derivative payables	288,844	240,482
Not designated as hedges | Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	10,522	9,654
Gross derivative payables	13,973	12,038
Not designated as hedges | Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	195,917	205,010
Gross derivative payables	198,116	210,623
Not designated as hedges | Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	98,845	57,689
Gross derivative payables	111,659	65,811
Not designated as hedges | Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	21,619	15,228
Gross derivative payables	19,327	16,286
Designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	581	978
Gross derivative payables	1,966	1,732
Designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	2
Gross derivative payables	1	0
Designated as hedges | Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	556	765
Gross derivative payables	1,880	1,640
Designated as hedges | Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	25	211
Gross derivative payables	$ 85	$ 92