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Segment Financial Data (By Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | $ 8,672 | $ 8,172 | $ 7,291
Total Assets | $ 96,920 |  |  |  | $ 89,706 |  |  |  | 96,920 | 89,706 | 87,484
Capital Expenditures |  |  |  |  |  |  |  |  | 2,014 | 1,699 | 1,652
Depreciation & Amortization |  |  |  |  |  |  |  |  | 2,140 | 1,962 | 1,863
Major Customers, U.S. Government Sales |  |  |  |  |  |  |  |  | 5,798 | 5,626 | 5,630
Net Sales | 15,680 | $ 15,062 | $ 15,280 | $ 13,815 | 14,659 | $ 14,354 | $ 14,874 | $ 13,357 | 59,837 | 57,244 | 56,098
Major Customers, Airbus Sales |  |  |  |  |  |  |  |  | 8,908 | 7,688 | $ 7,624
Sikorsky [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal Date |  |  |  |  |  |  |  |  |  |  | Nov. 06, 2015
Major Customers, U.S. Government Sales |  |  |  |  |  |  |  |  |  | 3,100 |
UTC Aerospace Systems [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 2,370 | 2,298 | $ 1,888
Total Assets | 34,567 |  |  |  | 34,093 |  |  |  | 34,567 | 34,093 | 34,736
Capital Expenditures |  |  |  |  |  |  |  |  | 527 | 452 | 537
Depreciation & Amortization |  |  |  |  |  |  |  |  | 823 | 807 | 796
Major Customers, U.S. Government Sales |  |  |  |  |  |  |  |  | 2,299 | 2,301 | 2,409
Net Sales |  |  |  |  |  |  |  |  | 14,691 | 14,465 | 14,094
Total Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 9,151 | 8,946 | 8,023
Total Assets | 93,413 |  |  |  | 87,718 |  |  |  | 93,413 | 87,718 | 85,205
Capital Expenditures |  |  |  |  |  |  |  |  | 1,909 | 1,611 | 1,573
Depreciation & Amortization |  |  |  |  |  |  |  |  | 2,044 | 1,882 | 1,785
Net Sales |  |  |  |  |  |  |  |  | 61,004 | 58,103 | 56,863
Eliminations and other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | (38) | (368) | (268)
Total Assets | 3,507 |  |  |  | 1,988 |  |  |  | 3,507 | 1,988 | 2,279
Capital Expenditures |  |  |  |  |  |  |  |  | 105 | 88 | 79
Depreciation & Amortization |  |  |  |  |  |  |  |  | 96 | 80 | 78
Net Sales |  |  |  |  |  |  |  |  | (1,167) | (859) | (765)
General corporate expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | (441) | (406) | (464)
Net Sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Major Customers, U.S. Government Sales |  |  |  |  |  |  |  |  | 152 | 138 | 276
Otis [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 2,021 | 2,147 | 2,338
Total Assets | 9,421 |  |  |  | 8,867 |  |  |  | 9,421 | 8,867 | 8,846
Capital Expenditures |  |  |  |  |  |  |  |  | 133 | 94 | 83
Depreciation & Amortization |  |  |  |  |  |  |  |  | 177 | 171 | 176
Net Sales |  |  |  |  |  |  |  |  | 12,341 | 11,893 | 11,980
UTC Climate, Controls and Security [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 3,300 | 2,956 | 2,936
Total Assets | 22,657 |  |  |  | 21,787 |  |  |  | 22,657 | 21,787 | 21,287
Capital Expenditures |  |  |  |  |  |  |  |  | 326 | 340 | 261
Depreciation & Amortization |  |  |  |  |  |  |  |  | 372 | 354 | 337
Net Sales |  |  |  |  |  |  |  |  | 17,812 | 16,851 | 16,707
Pratt and Whitney [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating profit |  |  |  |  |  |  |  |  | 1,460 | 1,545 | 861
Total Assets | $ 26,768 |  |  |  | $ 22,971 |  |  |  | 26,768 | 22,971 | 20,336
Capital Expenditures |  |  |  |  |  |  |  |  | 923 | 725 | 692
Depreciation & Amortization |  |  |  |  |  |  |  |  | 672 | 550 | 476
Major Customers, U.S. Government Sales |  |  |  |  |  |  |  |  | 3,347 | 3,187 | 2,945
Net Sales |  |  |  |  |  |  |  |  | $ 16,160 | $ 14,894 | $ 14,082

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