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Segment Reporting - Net Revenues by Geographic Area (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net revenues $ 6,773 $ 6,288 $ 6,112 $ 6,765 $ 6,966 $ 6,530 $ 5,986 $ 6,414 $ 25,938 $ 25,896 [1] $ 25,923 [1]
United States                      
Segment Reporting Information [Line Items]                      
Net revenues                 6,401 6,275 6,329
Other                      
Segment Reporting Information [Line Items]                      
Net revenues                 $ 19,537 $ 19,621 $ 19,594
[1] During the first quarter of 2018, 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 2018 presentation.