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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Allowance for credit losses $ 14 $ 17
Accumulated other comprehensive income tax $ 0 $ 0
Treasury stock shares 152,708 136,784
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 90,959,889 90,909,889
Common stock, shares outstanding 90,807,181 90,773,105
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