Regulatory capital (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Basel III
Capital ratios
CET1 - Minimum capital ratios	4.50%
CET1 - Well-capitalized ratios	6.50%
Tier 1 - Minimum capital ratio	6.00%
Tier 1 - Well capitalized ratio	8.00%
Total - Minimum capital ratio	8.00%
Total - 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	$ 111,000,000	$ 130,000,000
Adjustments to capital for deferred tax liabilities resulting from tax-deductible goodwill	3,000,000,000	2,700,000,000
JPMorgan Chase & Co. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	173,577,000,000	164,426,000,000
Tier 1 capital	199,222,000,000	186,294,000,000
Total capital	234,462,000,000	221,225,000,000
Assets
Risk-weighted	1,503,370,000,000	1,472,602,000,000
Adjusted average	$ 2,375,809,000,000	$ 2,465,414,000,000
Capital ratios
CET1	11.50%	11.20%
Tier 1	13.30%	12.70%
Total	15.60%	15.00%
Tier 1 leverage	8.40%	7.60%
JPMorgan Chase & Co. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 173,577,000,000	$ 164,426,000,000
Tier 1 capital	199,222,000,000	186,294,000,000
Total capital	223,962,000,000	210,684,000,000
Assets
Risk-weighted	1,502,685,000,000	1,608,240,000,000
Adjusted average	$ 2,375,809,000,000	$ 2,465,414,000,000
Capital ratios
CET1	11.60%	10.20%
Tier 1	13.30%	11.60%
Total	14.90%	13.10%
Tier 1 leverage	8.40%	7.60%
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	$ 999,000,000
JPMorgan Chase Bank, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	166,636,000,000	$ 156,567,000,000
Tier 1 capital	166,900,000,000	156,891,000,000
Total capital	181,404,000,000	173,328,000,000
Assets
Risk-weighted	1,287,699,000,000	1,230,358,000,000
Adjusted average	$ 1,920,310,000,000	$ 1,968,131,000,000
Capital ratios
CET1	12.90%	12.70%
Tier 1	13.00%	12.80%
Total	14.10%	14.10%
Tier 1 leverage	8.70%	8.00%
JPMorgan Chase Bank, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 166,636,000,000	$ 156,567,000,000
Tier 1 capital	166,900,000,000	156,891,000,000
Total capital	174,626,000,000	166,331,000,000
Assets
Risk-weighted	1,260,657,000,000	1,330,175,000,000
Adjusted average	$ 1,920,310,000,000	$ 1,968,131,000,000
Capital ratios
CET1	13.20%	11.80%
Tier 1	13.20%	11.80%
Total	13.90%	12.50%
Tier 1 leverage	8.70%	8.00%
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	$ 420,000,000
Chase Bank USA, N.A. | Basel III Standardized Transitional
Regulatory capital
CET1 capital	15,256,000,000	$ 14,556,000,000
Tier 1 capital	15,256,000,000	14,556,000,000
Total capital	21,201,000,000	20,517,000,000
Assets
Risk-weighted	101,533,000,000	103,468,000,000
Adjusted average	$ 133,525,000,000	$ 128,111,000,000
Capital ratios
CET1	15.00%	14.10%
Tier 1	15.00%	14.10%
Total	20.90%	19.80%
Tier 1 leverage	11.40%	11.40%
Chase Bank USA, N.A. | Basel III Advanced Transitional
Regulatory capital
CET1 capital	$ 15,256,000,000	$ 14,556,000,000
Tier 1 capital	15,256,000,000	14,556,000,000
Total capital	19,906,000,000	19,206,000,000
Assets
Risk-weighted	149,813,000,000	157,565,000,000
Adjusted average	$ 133,525,000,000	$ 128,111,000,000
Capital ratios
CET1	10.20%	9.20%
Tier 1	10.20%	9.20%
Total	13.30%	12.20%
Tier 1 leverage	11.40%	11.40%
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