Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 5,061 $ 3,349 $ 3,229
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 203 8 318
Trading inventory – other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 5,795 1,750 3,821
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 104 (475) 26
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 98 25 298
Long-term debt      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (1,176) 2,064 (1,190)
Other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 37 (23) (44)
Borrower-Specific Credit Risk      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 194 (148) 38
Market making and similar activities      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 4,977 3,502 2,993
Market making and similar activities | 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 203 8 318
Market making and similar activities | Trading inventory – other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 5,795 1,750 3,821
Market making and similar activities | 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 92 (422) (9)
Market making and similar activities | 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 1 0
Market making and similar activities | Long-term debt      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (1,098) 2,157 (1,044)
Market making and similar activities | Other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (15) 8 (93)
Other Income      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 84 (153) 236
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
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
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 12 (53) 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 98 24 298
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 (78) (93) (146)
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 $ (31) $ 49