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Long-Term Borrowings and Other Secured Financings (Long-term Borrowings by Type) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Long-term Borrowings by Type    
Senior debt $ 173,761 $ 154,472
Subordinated debt 10,351 10,303
Total $ 184,112 $ 164,775
Weighted average maturity of long-term borrowings 6 years 6 months 5 years 11 months