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Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 42	$ 40
Accumulated Other Comprehensive Income, Tax	$ 0	$ 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	75,230,400	71,609,049
Common stock, shares outstanding	75,100,952	71,475,755
Common Class B
Shares authorized	100	100
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100

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Tax effect of accumulated other comprehensive income (loss).

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