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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts $ 97 $ 130
Accumulated Other Comprehensive Income, Tax $ 0 $ 0
Treasury stock shares 134,439 135,815
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 68,119,412 64,121,150
Common stock, shares outstanding 67,984,973 63,985,335
Common Class B    
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100