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Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 85	$ 42
Accumulated other comprehensive income tax	$ 0	$ 0
Treasury stock shares	129,448	129,448
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	76,878,300	75,230,400
Common stock, shares outstanding	76,748,852	75,100,952
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

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