Regulatory Capital (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Basel III Standardized Transitional | JPMorgan Chase & Co.
Regulatory capital
CET1 capital	$ 184,708	$ 183,300
Tier 1 capital	210,321	208,644
Total capital	238,630	238,395
Assets
Risk-weighted	1,543,370	1,499,506
Adjusted average	$ 2,566,013	$ 2,514,270
Capital ratios
CET1	12.00%	12.20%
Tier 1	13.60%	13.90%
Total	15.50%	15.90%
Tier 1 leverage	8.20%	8.30%
Basel III Advanced Transitional | JPMorgan Chase & Co.
Regulatory capital
CET1 capital	$ 184,708	$ 183,300
Tier 1 capital	210,321	208,644
Total capital	229,027	227,933
Assets
Risk-weighted	1,438,747	1,435,825
Adjusted average	$ 2,566,013	$ 2,514,270
Capital ratios
CET1	12.80%	12.80%
Tier 1	14.60%	14.50%
Total	15.90%	15.90%
Tier 1 leverage	8.20%	8.30%
Total leverage exposure		$ 3,204,463
SLR		6.50%
Basel III Advanced Fully Phased-In | JPMorgan Chase & Co.
Capital ratios
Total leverage exposure	$ 3,255,296
SLR	6.50%
Bank Holding Companies | Basel III
Minimum capital ratios
CET1	9.00%	7.50%
Tier 1	10.50%	9.00%
Total	12.50%	11.00%
Tier 1 leverage	4.00%	4.00%
SLR	5.00%
Well-capitalized ratios
CET1	0.00%
Tier 1	6.00%
Total	10.00%
Tier 1 leverage	5.00%
SLR	0.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Capital conservation buffer phase-in amount	1.875%
Capital conservation buffer	2.50%
GSIB surcharge phase-in amount	2.625%
GSIB surcharge	3.50%
Insured Depository Institutions | Basel III
Minimum capital ratios
CET1	6.375%	5.75%
Tier 1	7.875%	7.25%
Total	9.875%	9.25%
Tier 1 leverage	4.00%	4.00%
SLR	6.00%
Well-capitalized ratios
CET1	6.50%
Tier 1	8.00%
Total	10.00%
Tier 1 leverage	5.00%
SLR	6.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Capital conservation buffer	2.50%
JPMorgan Chase Bank, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	$ 188,784	$ 184,375
Tier 1 capital	188,784	184,375
Total capital	200,065	195,839
Assets
Risk-weighted	1,356,526	1,338,970
Adjusted average	$ 2,153,804	$ 2,116,031
Capital ratios
CET1	13.90%	13.80%
Tier 1	13.90%	13.80%
Total	14.70%	14.60%
Tier 1 leverage	8.80%	8.70%
JPMorgan Chase Bank, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 188,784	$ 184,375
Tier 1 capital	188,784	184,375
Total capital	193,844	189,510
Assets
Risk-weighted	1,216,608	1,241,916
Adjusted average	$ 2,153,804	$ 2,116,031
Capital ratios
CET1	15.50%	14.80%
Tier 1	15.50%	14.80%
Total	15.90%	15.30%
Tier 1 leverage	8.80%	8.70%
Total leverage exposure		$ 2,775,041
SLR		6.60%
JPMorgan Chase Bank, N.A. | Basel III Advanced Fully Phased-In
Capital ratios
Total leverage exposure	$ 2,799,458
SLR	6.70%
Chase Bank USA, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	$ 22,447	$ 21,600
Tier 1 capital	22,447	21,600
Total capital	27,321	27,691
Assets
Risk-weighted	107,938	113,108
Adjusted average	$ 114,160	$ 126,517
Capital ratios
CET1	20.80%	19.10%
Tier 1	20.80%	19.10%
Total	25.30%	24.50%
Tier 1 leverage	19.70%	17.10%
Chase Bank USA, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 22,447	$ 21,600
Tier 1 capital	22,447	21,600
Total capital	25,947	26,250
Assets
Risk-weighted	178,118	190,523
Adjusted average	$ 114,160	$ 126,517
Capital ratios
CET1	12.60%	11.30%
Tier 1	12.60%	11.30%
Total	14.60%	13.80%
Tier 1 leverage	19.70%	17.10%
Total leverage exposure		$ 182,803
SLR		11.80%
Chase Bank USA, N.A. | Basel III Advanced Fully Phased-In
Capital ratios
Total leverage exposure	$ 172,003
SLR	13.10%