Quarterly report pursuant to Section 13 or 15(d)

Fair Value Option - Gains (Losses) Relating to Assets and Liabilities (Details)

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Fair Value Option - Gains (Losses) Relating to Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 2,137 $ 951 $ 5,596 $ 2,915
Loans reported as trading account assets        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 74 75 145 272
Trading inventory – other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1,693 1,217 3,649 2,890
Consumer and commercial loans        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 184 6 277 54
Loans held-for-sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 8 92 13 275
Long-term debt        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 124 (454) 1,422 (580)
Other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 54 15 90 4
Trading Account Profits        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 2,088 879 5,608 2,650
Trading Account Profits | Loans reported as trading account assets        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 74 75 145 272
Trading Account Profits | Trading inventory – other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1,693 1,217 3,649 2,890
Trading Account Profits | Consumer and commercial loans        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 176 10 301 19
Trading Account Profits | Loans held-for-sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0 1 0
Trading Account Profits | Long-term debt        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 143 (416) 1,497 (471)
Trading Account Profits | Other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 2 (7) 15 (60)
Other Income        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 49 72 (12) 265
Other Income | Loans reported as trading account assets        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0 0 0
Other Income | Trading inventory – other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0 0 0
Other Income | Consumer and commercial loans        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 8 (4) (24) 35
Other Income | Loans held-for-sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option 8 92 12 275
Other Income | Long-term debt        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option (19) (38) (75) (109)
Other Income | Other        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 52 $ 22 $ 75 $ 64