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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts $ 43 $ 40
Accumulated Other Comprehensive Income, Tax $ 1 $ 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 71,610,581 71,609,049
Common stock, shares outstanding 71,481,133 71,475,755
Common Class B    
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100