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Segment And Geographic Information (Geographic Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 1,903	$ 1,702	$ 1,396
Income before income taxes	1,196	1,049	761
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	1,501	1,393	1,046
Income before income taxes	1,029	947	632
International [Member]
Segment Reporting Information [Line Items]
Total net revenues	402	309	350
Income before income taxes	$ 167	$ 102	$ 129

X

- Definition

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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