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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Allowance for doubtful accounts $ 95 $ 97
Accumulated Other Comprehensive Income, Tax $ 1 $ 0
Treasury stock shares 133,380 134,439
Common Class A    
Common stock, par value $ 0.01 $ 0.01
Shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 70,384,414 68,119,412
Common stock, shares outstanding 70,251,034 67,984,973
Common Class B    
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100