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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 41 $ 40
Accumulated Other Comprehensive Income, Tax $ 0 $ 1
Treasury stock shares 129,448 133,294
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 75,226,888 71,609,049
Common stock, shares outstanding 75,097,440 71,475,755
Common Class B    
Common stock, par value $ 0.01 $ 0.01
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100