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Segment And Geographic Information (Geographic Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 413	$ 445	$ 971	$ 972
Income before income taxes	225	271	564	611
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues	310	345	771	765
Income before income taxes	182	231	495	525
International [Member]
Segment Reporting Information [Line Items]
Total net revenues	103	100	200	207
Income before income taxes	$ 43	$ 40	$ 69	$ 86

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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