Quarterly report pursuant to Section 13 or 15(d)

Fair Value Option - Gains (Losses) Related to Borrower-specific Credit Risk (Details)

v3.8.0.1
Fair Value Option - Gains (Losses) Related to Borrower-specific Credit Risk (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Loans reported as trading account assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) related to borrower-specific credit risk for assets accounted for under the fair value option $ 13 $ 13
Consumer and commercial loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) related to borrower-specific credit risk for assets accounted for under the fair value option (17) 19
Loans held-for-sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) related to borrower-specific credit risk for assets accounted for under the fair value option $ (3) $ 0