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Segment And Geographic Information (Geographic Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 558	$ 527
Income before income taxes	339	340
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	461	420
Income before income taxes	313	294
International [Member]
Segment Reporting Information [Line Items]
Total net revenues	97	107
Income before income taxes	$ 26	$ 46

X

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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