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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II UNITED TECHNOLOGIES CORPORATION AND SUBSIDIARIES Valuation and Qualifying Accounts Three years ended December 31, 2016 (Millions of Dollars)
Allowances for Doubtful Accounts and Other Customer Financing Activity: |  |
Balance, December 31, 2013 |  | $ | 538 |
Provision charged to income |  | 93 |
Doubtful accounts written off (net) |  | (91 | )
Other adjustments |  | (46 | )
Balance, December 31, 2014 |  | 494 |
Provision charged to income |  | 137 |
Doubtful accounts written off (net) |  | (59 | )
Other adjustments |  | (19 | )
Balance, December 31, 2015 |  | 553 |
Provision charged to income |  | 64 |
Doubtful accounts written off (net) |  | (105 | )
Other adjustments |  | (45 | )
Balance, December 31, 2016 |  | $ | 467 |
Future Income Tax Benefits—Valuation allowance: |  |
Balance, December 31, 2013 |  | $ | 942 |
Additions charged to income tax expense |  | 91 |
Reductions credited to income tax expense |  | (55 | )
Other adjustments 1 |  | (366 | )
Balance, December 31, 2014 |  | 612 |
Additions charged to income tax expense |  | 42 |
Additions charged to goodwill, due to acquisitions |  | 7 |
Reductions credited to income tax expense |  | (41 | )
Other adjustments 1 |  | (29 | )
Balance, December 31, 2015 |  | 591 |
Additions charged to income tax expense |  | 32 |
Reductions credited to income tax expense |  | (61 | )
Other adjustments |  | (17 | )
Balance, December 31, 2016 |  | $ | 545 |
Note 1: Included in Other adjustments in the table above are adjustments to valuation allowances associated with an agreement with a state taxing authority for the monetization of tax credits.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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