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Net Revenues by Geographic Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Net revenues $ 7,364 $ 6,849 $ 7,661 $ 7,762 $ 8,830 $ 8,337 $ 8,436 $ 8,641 $ 29,636 $ 34,244 [1] $ 35,299 [1]
United States                      
Segment Reporting Information [Line Items]                      
Net revenues                 6,302 6,143 5,965
Other                      
Segment Reporting Information [Line Items]                      
Net revenues                 $ 23,334 $ 28,101 $ 29,334
[1] During 2014, we realigned some of our products across product categories and as such, we reclassified the product category net revenues on a basis consistent with the 2015 presentation.