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Segment Information (Net Revenue By Geographic Area) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Revenue from External Customer [Line Items]                      
Net revenue $ 1,527 $ 1,149 $ 898 $ 1,271 $ 1,308 $ 1,070 $ 815 $ 1,203 $ 4,845 $ 4,396 $ 4,515
North America [Member]                      
Revenue from External Customer [Line Items]                      
Net revenue from unaffiliated customers                 2,119 1,907 1,956
International [Member]                      
Revenue from External Customer [Line Items]                      
Net revenue from unaffiliated customers                 $ 2,726 $ 2,489 $ 2,559