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Fair Value Changes in FV under the FV Option (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk $ (249) $ (625) $ 125
Other changes in fair value 91 265 (45)
Fair value gains (losses), net (158) (360) 80
Loans [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk - Loans 67 23 86
Other changes in fair value 69 72 (191)
Fair value gains (losses), net 136 95 (105)
Long-term debt [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Changes in instrument-specific credit risk - Long-Term Debt (316) (648) 39
Other changes in fair value 22 193 146
Fair value gains (losses), net $ (294) $ (455) $ 185