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Long-term Debt - Junior Subordinated Debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
entity
Dec. 31, 2017
USD ($)
Dec. 18, 2017
USD ($)
entity
Debt Instrument [Line Items]      
Number of issuer trusts that had issued guaranteed capital debt securities | entity 8    
Number of liquidated issuer trusts that had issued guaranteed capital debt securities | entity     7
Cancellation of trust preferred securities     $ 1,600
Cancellation of trust common securities     $ 56
JPMorgan Chase & Co.      
Debt Instrument [Line Items]      
Payments for repurchase of trust preferred securities $ 1,600    
JPMorgan Chase & Co. | Basel III      
Debt Instrument [Line Items]      
Debentures qualified as Tier 2 capital $ 1,400 $ 300