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Segment And Geographic Information (Geographic Table) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | $ 387 | $ 369 | $ 761 | $ 858
Income before income taxes | 204 | 213 | 417 | 550
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 316 | 278 | 619 | 682
Income before income taxes | 186 | 177 | 381 | 485
International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 71 | 91 | 142 | 176
Income before income taxes | $ 18 | $ 36 | $ 36 | $ 65

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