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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Examination [Line Items] |  |  |  |  |
Estimated Tax Settlement Interest Gain (Loss) Noncash, Range, Lower Limit |  |  |  |  | $ 220
Change in Unrecognized Tax Benefits Is Reasonably Possible Estimated Range of Change, Lower Bound | $ 50 |  | $ 50 |  |
Change in Unrecognized Tax Benefits Is Reasonably Possible Estimated Range of Change, Upper Bound | 495 |  | 495 |  |
Balance at January 1 |  |  | 1,169 | $ 1,089 | 1,223
Additions for tax positions related to the current year |  |  | 69 | 206 | 164
Additions for tax positions of prior years |  |  | 167 | 99 | 435
Reductions for tax positions of prior years |  |  | 61 | 101 | 47
Settlements |  |  | 258 | 124 | 686
Balance at December 31 | 1,086 |  | 1,086 | 1,169 | 1,089
Gross interest expense related to unrecognized tax benefits |  |  | 41 | 39 | 180
Total accrued interest balance at December 31 | 185 |  | $ 185 | $ 176 | 292
Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions, Uncertain Timing |  |  |  |  | 87
Closure of IRS audit of UTC Tax Years 2011-2012 [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Settlement Gain (Loss) Noncash | 172 |  |  |  |
Tax Settlement Interest Gain (Loss) Noncash | $ 22 |  |  |  |
Closure of IRS audit of Goodrich Corporation Tax Years 2011-2012 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Settlement Gain (Loss) Noncash |  | $ 58 |  |  |
Resolution of various tax audit, appeal & litigation activity [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax Settlement Gain (Loss) Noncash |  |  |  |  | 508
Tax Settlement Interest Gain (Loss) Noncash |  |  |  |  | $ 132

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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