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Equity Method Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investments
Equity Method Investment Balances
$ in millions
At
September 30,
2019
At
December 31,
2018
Investments
$
2,391

$
2,432

 
Three Months Ended
September 30,
Nine Months Ended
September 30,
$ in millions
2019
2018
2019
2018
Income (loss)
$
(13
)
$
8

$
(39
)
$
62
Schedule of Joint Ventures
Japanese Securities Joint Venture
 
Three Months Ended
September 30,
Nine Months Ended
September 30,
$ in millions
2019
2018
2019
2018
Income (loss) from investment in MUMSS
$
(4
)
$
17

$
5

$
99