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Equity Method Investments (Tables)
3 Months Ended
Mar. 31, 2018
Equity Method Investments  
Schedule of Equity Method Investments
Equity Method Investment Balances
$ in millionsAt March 31, 2018At December 31, 2017
Investments$2,662$2,623

Three Months Ended March 31,
$ in millions20182017
Income (loss)$50$9
MUMSS  
Equity Method Investments  
Schedule of Equity Method Investments
Three Months Ended March 31,
$ in millions20182017
Income from investment in MUMSS$56$48