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Borrowings and Other Secured Financings (Failed Sales by Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Borrowings and Other Secured Financings    
2017 $ 0 $ 112
2018 22 17
2019 4 53
2020 109 55
2021 69 28
2022 59 4
Thereafter 289 16
Total $ 552 $ 285