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Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Allowance for credit losses $ 20 $ 86
Accumulated other comprehensive income tax $ 0 $ 0
Treasury stock shares 135,205 138,930
Common Class A [Member]    
Common stock, par value $ 0.01 $ 0.01
Shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 78,187,067 76,889,040
Common stock, shares outstanding 78,051,862 76,750,110
Common Class B [Member]    
Common stock, par value $ 0.01 $ 0.01
Shares authorized 100 100
Common stock, shares issued 100 100
Common stock, shares outstanding 100 100