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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Examination [Line Items] |  |  |  |  |  |
Balance at January 1 |  |  |  | $ 1,086 | $ 1,169 | $ 1,089
Additions for tax positions related to the current year |  |  |  | 192 | 69 | 206
Additions for tax positions of prior years |  |  |  | 73 | 167 | 99
Reductions for tax positions of prior years |  |  |  | 91 | 61 | 101
Settlements |  |  |  | 71 | 258 | 124
Balance at December 31 |  | $ 1,086 |  | 1,189 | 1,086 | 1,169
Gross interest expense related to unrecognized tax benefits |  |  |  | 34 | 41 | 39
Total accrued interest balance at December 31 |  | 185 |  | 215 | $ 185 | $ 176
Minimum [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | 40 |  |
Maximum [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | $ 435 |  |
Closure of IRS audit of Goodrich Corporation Tax Years 2011-2012 [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Tax Settlement Gain (Loss) Noncash |  |  | $ 58 |  |  |
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 UTC Tax Year 2013 [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Tax Settlement Gain (Loss) Noncash | $ 64 |  |  |  |  |
Tax Settlement Interest Gain (Loss) Noncash | $ 9 |  |  |  |  |

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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=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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