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Segment And Geographic Information (Geographic Table) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total net revenues $ 1,702 $ 1,396 $ 1,189
Income before income taxes 1,049 761 458
United States [Member]      
Segment Reporting Information [Line Items]      
Total net revenues 1,393 1,046 832
Income before income taxes 947 632 294
International [Member]      
Segment Reporting Information [Line Items]      
Total net revenues 309 350 357
Income before income taxes $ 102 $ 129 $ 164