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Equity Method Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investments
Equity Method Investment Balances
$ in millions
At
June 30,
2019
At
December 31,
2018
Investments
$
2,404

$
2,432

 
Three Months Ended
June 30,
Six Months Ended
June 30,
$ in millions
2019
2018
2019
2018
Income (loss)
$
(16
)
$
4

$
(26
)
$
54
Schedule of Joint Ventures
Japanese Securities Joint Venture
 
Three Months Ended
June 30,
Six Months Ended
June 30,
$ in millions
2019
2018
2019
2018
Income from investment in MUMSS
$
6

$
26

$
9

$
82