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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 | 6 Months Ended
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Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Sales by geographic area |  |  |  |
Sales | $ 20,830 | $ 18,839 | $ 40,839 | $ 36,605
Percentage Change In Sales By Geographic Area | 10.60% |  | 11.60% |
United States |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 10,640 | 9,726 | $ 20,591 | 19,104
Percentage Change In Sales By Geographic Area | 9.40% |  | 7.80% |
Europe |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 4,810 | 4,232 | $ 9,607 | 8,090
Percentage Change In Sales By Geographic Area | 13.70% |  | 18.80% |
Western Hemisphere, excluding U.S. |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 1,540 | 1,499 | $ 3,107 | 2,953
Percentage Change In Sales By Geographic Area | 2.70% |  | 5.20% |
Asia-Pacific, Africa |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 3,840 | $ 3,382 | $ 7,534 | $ 6,458
Percentage Change In Sales By Geographic Area | 13.50% |  | 16.70% |

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