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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Allowance for doubtful accounts $ 99 $ 130
Accumulated Other Comprehensive Income, Tax $ 0 $ 0
Treasury stock shares 844,715 135,815
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 66,516,360 64,121,150
Common stock, shares outstanding 65,671,645 63,985,335
Common Class B    
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100