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Segments of Business and Geographic Areas (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2015 | Sep. 28, 2014 | Sep. 27, 2015 | Sep. 28, 2014
Sales by geographic area |  |  |  |
Sales | $ 17,102 | $ 18,467 | $ 52,263 | $ 56,077
Percentage Change In Sales By Geographic Area | (7.40%) |  | (6.80%) |
UNITED STATES |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 8,791 | 8,842 | $ 26,394 | 26,178
Percentage Change In Sales By Geographic Area | (0.60%) |  | 0.80% |
Europe |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 3,802 | 4,446 | $ 11,993 | 14,387
Percentage Change In Sales By Geographic Area | (14.50%) |  | (16.60%) |
Western Hemisphere, excluding U.S. |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 1,463 | 1,820 | $ 4,603 | 5,378
Percentage Change In Sales By Geographic Area | (19.60%) |  | (14.40%) |
Asia-Pacific, Africa |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 3,046 | $ 3,359 | $ 9,273 | $ 10,134
Percentage Change In Sales By Geographic Area | (9.30%) |  | (8.50%) |

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