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Goodwill and Other Intangible Assets - by Business Segment (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]        
Goodwill $ 47,453us-gaap_Goodwill $ 47,647us-gaap_Goodwill $ 48,065us-gaap_Goodwill $ 48,081us-gaap_Goodwill
Consumer & Community Banking        
Goodwill [Line Items]        
Goodwill 30,874us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_ConsumerCommunityBankingMember		 30,941us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_ConsumerCommunityBankingMember		    
Corporate & Investment Bank        
Goodwill [Line Items]        
Goodwill 6,776us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_CorporateInvestmentBankMember		 6,780us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_CorporateInvestmentBankMember		    
Commercial Banking        
Goodwill [Line Items]        
Goodwill 2,861us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_CommercialBankingMember		 2,861us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_CommercialBankingMember		    
Asset Management        
Goodwill [Line Items]        
Goodwill 6,942us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_AssetManagementSegmentMember		 6,964us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= jpm_AssetManagementSegmentMember		    
Corporate        
Goodwill [Line Items]        
Goodwill $ 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 101us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember