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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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 $ 5 $ 0 $ 25 $ 5
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 (10) 14 31 (25)
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 $ (2) $ (10) $ (3) $ (6)