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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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Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Sales by geographic area |  |  |  |
Sales | $ 20,562 | $ 20,830 | $ 40,583 | $ 40,839
Percentage Change In Sales By Geographic Area | (1.30%) |  | (0.60%) |
United States |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 10,403 | 10,640 | $ 20,532 | 20,591
Percentage Change In Sales By Geographic Area | (2.20%) |  | (0.30%) |
Europe |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 4,733 | 4,810 | $ 9,342 | 9,607
Percentage Change In Sales By Geographic Area | (1.60%) |  | (2.80%) |
Western Hemisphere, excluding U.S. |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 1,455 | 1,540 | $ 2,958 | 3,107
Percentage Change In Sales By Geographic Area | (5.50%) |  | (4.80%) |
Asia-Pacific, Africa |  |  |  |
Sales by geographic area |  |  |  |
Sales | $ 3,971 | $ 3,840 | $ 7,751 | $ 7,534
Percentage Change In Sales By Geographic Area | 3.40% |  | 2.90% |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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