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, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 3,349 $ 3,229 $ 774
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 8 318 301
Trading inventory – other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1,750 3,821 57
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 (475) 26 12
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 25 298 535
Unfunded loan commitments      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (49) 36 487
Long-term debt      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 2,064 (1,190) (586)
Other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 26 (80) (32)
Trading Account Profits      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 3,502 2,993 (156)
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 8 318 301
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 1,750 3,821 57
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 (422) (9) 49
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 1 0 11
Trading Account Profits | Unfunded loan commitments      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0 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 2,157 (1,044) (489)
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 8 (93) (85)
Other Income      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (153) 236 930
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 (53) 35 (37)
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 24 298 524
Other Income | Unfunded loan commitments      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option (49) 36 487
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 (93) (146) (97)
Other Income | Other      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 18 $ 13 $ 53