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Restructuring and Other Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | $ (186) |
Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (112) |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (76) |
Non-service pension cost (benefit) [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (2) |
Otis [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (50) |
UTC Climate, Controls & Security [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (52) |
Pratt & Whitney [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (3) |
UTC Aerospace Systems [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (77) |
Eliminations and other [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (4) |
Current Year Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (97) |
Restructuring Reserve | $ 51 | $ 48 |  | 51 |
Net pre-tax restructuring costs (reversals) | 24 | 61 | $ 12 | 97 |
Utilization and foreign exchange | 21 |  |  | 46 |
Expected Costs | 180 |  |  | 180 |
Remaining Costs | 83 |  |  | 83 |
Current Year Actions [Member] | Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | 48 | 48 |  | 48 |
Net pre-tax restructuring costs (reversals) | 19 |  |  | 90 |
Utilization and foreign exchange | 19 |  |  | 42 |
Current Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | 3 | 0 |  | 3 |
Net pre-tax restructuring costs (reversals) | 5 |  |  | 7 |
Utilization and foreign exchange | 2 |  |  | 4 |
Current Year Actions [Member] | Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (47) |
Current Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (52) |
Current Year Actions [Member] | Non-service pension cost (benefit) [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | 2 |
Current Year Actions [Member] | Otis [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 2 | 18 | 9 |  |
Expected Costs | 40 |  |  | 40 |
Remaining Costs | 11 |  |  | 11 |
Current Year Actions [Member] | UTC Climate, Controls & Security [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 14 | 23 | 1 |  |
Expected Costs | 97 |  |  | 97 |
Remaining Costs | 59 |  |  | 59 |
Current Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 0 | 3 | 0 |  |
Expected Costs | 3 |  |  | 3 |
Remaining Costs | 0 |  |  | 0 |
Current Year Actions [Member] | UTC Aerospace Systems [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 8 | 15 | 0 |  |
Expected Costs | 36 |  |  | 36 |
Remaining Costs | 13 |  |  | 13 |
Current Year Actions [Member] | Eliminations and other [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 0 | (2) | (2) |  |
Expected Costs | 4 |  |  | 4 |
Remaining Costs | 0 |  |  | 0 |
Prior Year Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (76) |
Restructuring Reserve | 52 | 70 |  | 52 | $ 85
Net pre-tax restructuring costs (reversals) | 9 | 16 | 51 | 76 | 176
Utilization and foreign exchange | 27 |  |  | 109 |
Expected Costs | 368 |  |  | 368 |
Remaining Costs | 116 |  |  | 116 |
Prior Year Actions [Member] | Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | 57 | 73 |  | 57 | 84
Net pre-tax restructuring costs (reversals) | 3 |  |  | 50 |
Utilization and foreign exchange | 19 |  |  | 77 |
Prior Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Reserve | (5) | (3) |  | (5) | 1
Net pre-tax restructuring costs (reversals) | 6 |  |  | 26 |
Utilization and foreign exchange | 8 |  |  | 32 |
Prior Year Actions [Member] | Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (56) |
Prior Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (20) |
Prior Year Actions [Member] | Otis [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 1 | 4 | 15 |  | 43
Expected Costs | 69 |  |  | 69 |
Remaining Costs | 6 |  |  | 6 |
Prior Year Actions [Member] | UTC Climate, Controls & Security [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | (1) | (5) | 7 |  | 76
Expected Costs | 78 |  |  | 78 |
Remaining Costs | 1 |  |  | 1 |
Prior Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 0 | 0 | 0 |  | 7
Expected Costs | 7 |  |  | 7 |
Remaining Costs | 0 |  |  | 0 |
Prior Year Actions [Member] | UTC Aerospace Systems [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 9 | 17 | 29 |  | 43
Expected Costs | 207 |  |  | 207 |
Remaining Costs | 109 |  |  | 109 |
Prior Year Actions [Member] | Eliminations and other [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs (reversals) | 0 | $ 0 | $ 0 |  | $ 7
Expected Costs | 7 |  |  | 7 |
Remaining Costs | 0 |  |  | 0 |
Two Years Prior Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Charges |  |  |  | (13) |
Restructuring Reserve | $ 83 |  |  | $ 83 |

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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