Regulatory Capital (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2020	Dec. 31, 2019
CECL adoption impact
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Decrease to retained earnings due to CECL adoption	$ 2,700
Amount excluded from capital measures of the Firm		$ 5,700
CECL adoption impact | Excluding PCD Loans
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Increase in allowance for credit losses, excluding allowances on PCD loans		12,200
Basel III Standardized | JPMorgan Chase & Co.
Risk-based capital metrics:
CET1 capital		205,078	$ 187,753
Tier 1 capital		234,844	214,432
Total capital		269,923	242,589
Risk-weighted assets		$ 1,560,609	$ 1,515,869
CET1 capital ratio		13.10%	12.40%
Tier 1 capital ratio		0.150	0.141
Total capital ratio		0.173	0.160
Leverage-based capital metrics:
Adjusted average assets		$ 3,353,319	$ 2,730,239
Tier 1 leverage ratio		0.070	0.079
Basel III Advanced | JPMorgan Chase & Co.
Risk-based capital metrics:
CET1 capital		$ 205,078	$ 187,753
Tier 1 capital		234,844	214,432
Total capital		257,228	232,112
Risk-weighted assets		$ 1,484,431	$ 1,397,878
CET1 capital ratio		13.80%	13.40%
Tier 1 capital ratio		0.158	0.153
Total capital ratio		0.173	0.166
Leverage-based capital metrics:
Adjusted average assets		$ 3,353,319	$ 2,730,239
Tier 1 leverage ratio		0.070	0.079
Total leverage exposure		$ 3,401,542	$ 3,423,431
SLR		0.069	0.063
BHC | Basel III
Well-capitalized ratios
Tier 1 capital		0.060
Total capital		0.100
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
GSIB surcharge		3.50%
Countercyclical buffer		0
SLR, minimum requirement		3.00%
SLR, supplementary leverage buffer		2.00%
BHC | Basel III Standardized
Minimum capital ratios
CET1 capital		11.30%	10.50%
Tier 1 capital		0.128	0.120
Total capital		0.148	0.140
Tier 1 leverage		0.040	0.040
SLR			5.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Stress capital buffer		3.30%
BHC | Basel III Advanced
Minimum capital ratios
CET1 capital		10.50%
Tier 1 capital		0.120
Total capital		0.140
Tier 1 leverage		0.040
SLR		5.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Capital conservation buffer		2.50%
IDI | Basel III
Well-capitalized ratios
CET1 capital		6.50%
Tier 1 capital		0.080
Total capital		0.100
Tier 1 leverage		0.050
SLR		6.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Capital conservation buffer		2.50%
SLR, minimum requirement		3.00%
SLR, supplementary leverage buffer		3.00%
IDI | Basel III Standardized
Minimum capital ratios
CET1 capital		7.00%
Tier 1 capital		0.085
Total capital		0.105
Tier 1 leverage		0.040
IDI | Basel III Advanced
Minimum capital ratios
CET1 capital		7.00%
Tier 1 capital		0.085
Total capital		0.105
Tier 1 leverage		0.040
SLR		6.00%
JPMorgan Chase Bank, N.A. | Basel III Standardized
Risk-based capital metrics:
CET1 capital		$ 234,235	$ 206,848
Tier 1 capital		234,237	206,851
Total capital		252,045	224,390
Risk-weighted assets		$ 1,492,138	$ 1,457,689
CET1 capital ratio		15.70%	14.20%
Tier 1 capital ratio		0.157	0.142
Total capital ratio		0.169	0.154
Leverage-based capital metrics:
Adjusted average assets		$ 2,970,285	$ 2,353,432
Tier 1 leverage ratio		0.079	0.088
JPMorgan Chase Bank, N.A. | Basel III Advanced
Risk-based capital metrics:
CET1 capital		$ 234,235	$ 206,848
Tier 1 capital		234,237	206,851
Total capital		239,673	214,091
Risk-weighted assets		$ 1,343,185	$ 1,269,991
CET1 capital ratio		17.40%	16.30%
Tier 1 capital ratio		0.174	0.163
Total capital ratio		0.178	0.169
Leverage-based capital metrics:
Adjusted average assets		$ 2,970,285	$ 2,353,432
Tier 1 leverage ratio		0.079	0.088
Total leverage exposure		$ 3,688,797	$ 3,044,509
SLR		0.063	0.068