Regulatory capital (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Basel III
Capital ratios
CET1 - Minimum capital ratios	4.50%
CET1 - Well-capitalized ratios	6.50%
Tier 1 capital - Minimum capital ratio	6.00%
Tier 1 capital - Well capitalized ratio	8.00%
Total capital - Minumum capital ratio	8.00%
Total capital - Well-capitalized ratio	10.00%
Tier 1 leverage - Minimum capital ratio	4.00%
Tier 1 leverage - Well-capitalized ratio	5.00%
Adjustments to Capital for Deferred Tax Liabilities [Abstract]
Adjustments to capital for deferred tax liabilities resulting from nontaxable business combinations	$ 117,000,000	$ 130,000,000
Adjustments to capital for deferred tax liabilities resulting from tax-deductible goodwill	2,800,000,000	2,700,000,000
JPMorgan Chase & Co. | Basel III
Regulatory capital, assets and risk based ratios - supplemental information [Abstract]
Trust preferred securities included in Basel III Tier I capital	960,000,000
JPMorgan Chase & Co. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	169,769,000,000	164,426,000,000
Tier 1 capital	194,725,000,000	186,294,000,000
Total capital	228,390,000,000	221,225,000,000
Assets
Risk-weighted assets	1,499,638,000,000	1,472,602,000,000
Adjusted average assets	$ 2,448,357,000,000	$ 2,465,414,000,000
Capital ratios
CET1	11.30%	11.20%
Tier 1 capital	13.00%	12.70%
Total capital	15.20%	15.00%
Tier 1 leverage	8.00%	7.60%
JPMorgan Chase & Co. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 169,769,000,000	$ 164,426,000,000
Tier 1 capital	194,725,000,000	186,294,000,000
Total capital	218,811,000,000	210,684,000,000
Assets
Risk-weighted assets	1,520,140,000,000	1,608,240,000,000
Adjusted average assets	$ 2,448,357,000,000	$ 2,465,414,000,000
Capital ratios
CET1	11.20%	10.20%
Tier 1 capital	12.80%	11.60%
Total capital	14.40%	13.10%
Tier 1 leverage	8.00%	7.60%
JPMorgan Chase Bank, N.A. | Basel III
Regulatory capital, assets and risk based ratios - supplemental information [Abstract]
Trust preferred securities included in Basel III Tier I capital	$ 150,000,000
JPMorgan Chase Bank, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	161,814,000,000	$ 156,567,000,000
Tier 1 capital	161,966,000,000	156,891,000,000
Total capital	177,249,000,000	173,328,000,000
Assets
Risk-weighted assets	1,274,043,000,000	1,230,358,000,000
Adjusted average assets	$ 1,982,100,000,000	$ 1,968,131,000,000
Capital ratios
CET1	12.70%	12.70%
Tier 1 capital	12.70%	12.80%
Total capital	13.90%	14.10%
Tier 1 leverage	8.20%	8.00%
JPMorgan Chase Bank, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 161,814,000,000	$ 156,567,000,000
Tier 1 capital	161,966,000,000	156,891,000,000
Total capital	170,346,000,000	166,331,000,000
Assets
Risk-weighted assets	1,275,783,000,000	1,330,175,000,000
Adjusted average assets	$ 1,982,100,000,000	$ 1,968,131,000,000
Capital ratios
CET1	12.70%	11.80%
Tier 1 capital	12.70%	11.80%
Total capital	13.40%	12.50%
Tier 1 leverage	8.20%	8.00%
Chase Bank USA, N.A. | Basel III
Regulatory capital, assets and risk based ratios - supplemental information [Abstract]
Trust preferred securities included in Basel III Tier I capital	$ 0
Chase Bank USA, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	15,002,000,000	$ 14,556,000,000
Tier 1 capital	15,002,000,000	14,556,000,000
Total capital	20,952,000,000	20,517,000,000
Assets
Risk-weighted assets	101,754,000,000	103,468,000,000
Adjusted average assets	$ 129,421,000,000	$ 128,111,000,000
Capital ratios
CET1	14.70%	14.10%
Tier 1 capital	14.70%	14.10%
Total capital	20.60%	19.80%
Tier 1 leverage	11.60%	11.40%
Chase Bank USA, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 15,002,000,000	$ 14,556,000,000
Tier 1 capital	15,002,000,000	14,556,000,000
Total capital	19,652,000,000	19,206,000,000
Assets
Risk-weighted assets	156,286,000,000	157,565,000,000
Adjusted average assets	$ 129,421,000,000	$ 128,111,000,000
Capital ratios
CET1	9.60%	9.20%
Tier 1 capital	9.60%	9.20%
Total capital	12.60%	12.20%
Tier 1 leverage	11.60%	11.40%