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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts $ 86 $ 42
Common stock, par value $ 0.01 $ 0.01
Accumulated other comprehensive income tax $ 0 $ 0
Treasury stock shares 138,930 129,448
Common Class A    
Common stock, par value $ 0.01  
Shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 76,889,040 75,230,400
Common stock, shares outstanding 76,750,110 75,100,952
Common Class B    
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100