Derivative Instruments - Impact on Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Gross derivative receivables	$ 627,898	$ 665,587
Net derivative receivables	59,849	60,967
Gross derivative payables	618,318	653,218
Net derivative payables	46,403	39,661
Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	296,564	290,734
Net derivative receivables	25,096	24,945
Gross derivative payables	272,931	274,228
Net derivative payables	7,797	9,239
Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	13,123	11,087
Net derivative receivables	432	814
Gross derivative payables	19,443	13,796
Net derivative payables	3,055	1,898
Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	164,193	262,920
Net derivative receivables	20,024	25,312
Gross derivative payables	156,442	254,567
Net derivative payables	12,567	15,597
Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	130,266	85,220
Net derivative receivables	7,796	5,285
Gross derivative payables	150,483	96,139
Net derivative payables	17,427	8,648
Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	23,752	15,626
Net derivative receivables	6,501	4,611
Gross derivative payables	19,019	14,488
Net derivative payables	5,557	4,279
Not designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	627,374	663,566
Gross derivative payables	617,393	651,865
Not designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	296,564	290,734
Gross derivative payables	272,928	274,226
Not designated as hedges | Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	13,123	11,087
Gross derivative payables	19,443	13,796
Not designated as hedges | Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	163,687	261,035
Gross derivative payables	155,602	253,289
Not designated as hedges | Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	130,266	85,220
Gross derivative payables	150,483	96,139
Not designated as hedges | Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	23,734	15,490
Gross derivative payables	18,937	14,415
Designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	524	2,021
Gross derivative payables	925	1,353
Designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	3	2
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	506	1,885
Gross derivative payables	840	1,278
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	18	136
Gross derivative payables	$ 82	$ 73