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Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | $ 951 | $ 987
Derivative Assets | 101 | 170
Derivative liabilities | 533 | 354
Recurring fair value measurements | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 951 | 987
Derivative Assets | 0 | 0
Derivative liabilities | 0 | 0
Recurring fair value measurements | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 101 | 170
Derivative liabilities | 533 | 354
Recurring fair value measurements | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Derivative Assets | 0 | 0
Derivative liabilities | 0 | $ 0
UTC Climate, Controls and Security [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gain (Loss) on Disposition of Business | 126 |
UTC Aerospace Systems [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Method Investment, Other than Temporary Impairment | $ 61 |

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