Quarterly report pursuant to Section 13 or 15(d)

Fair Value Option - Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option (Details)

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Fair Value Option - Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Loans reported as trading account assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option $ (389) $ 12
Consumer and commercial loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option (349) 19
Loans held-for-sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option (74) 11
Unfunded loan commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gains (Losses) Related to Borrower-specific Credit Risk for Assets Accounted for Under the Fair Value Option $ (116) $ 63