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Segments of Business and Geographic Areas - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Sales by geographic area |  |  |  |
Sales | $ 20,348 | $ 19,650 | $ 61,187 | $ 56,255
Percentage Change In Sales By Geographic Area | 3.60% |  | 8.80% |
United States |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 10,664 | 10,290 | $ 31,255 | 29,394
Percentage Change In Sales By Geographic Area | 3.60% |  | 6.30% |
Europe |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 4,416 | 4,308 | $ 14,023 | 12,398
Percentage Change In Sales By Geographic Area | 2.50% |  | 13.10% |
Western Hemisphere, excluding U.S. |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 1,550 | 1,569 | $ 4,657 | 4,522
Percentage Change In Sales By Geographic Area | (1.20%) |  | 3.00% |
Asia-Pacific, Africa |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 3,718 | $ 3,483 | $ 11,252 | $ 9,941
Percentage Change In Sales By Geographic Area | 6.70% |  | 13.20% |

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