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Segment And Geographic Information (Geographic Table) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Total net revenues $ 466 $ 439 $ 1,437 $ 1,411
Income before income taxes 281 276 845 887
United States [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 346 346 1,117 1,111
Income before income taxes 222 237 717 762
International [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 120 93 320 300
Income before income taxes $ 59 $ 39 $ 128 $ 125