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Restructuring Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | $ 56 |  | $ 99 |
Cost of Sales [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 1 |  | 21 |
Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 55 |  | 78 |
Pratt & Whitney [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | (16) |  | 4 |
Collins Aerospace Systems [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 12 |  | 30 |
Eliminations and other [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 60 |  | 65 |
Current Year Actions [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 65 |  | 101 |
Utilization, foreign exchange and other costs | (27) |  | (31) |
Restructuring Reserve | 70 | $ 32 | 70 | $ 0
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 147 |  | 147 |
Costs Incurred | (65) | (36) |  |
Remaining Costs | 46 |  | 46 |
Current Year Actions [Member] | Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 63 |  | 87 |
Utilization, foreign exchange and other costs | (25) |  | (26) |
Restructuring Reserve | 61 | 23 | 61 | 0
Current Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 2 |  | 14 |
Utilization, foreign exchange and other costs | (2) |  | (5) |
Restructuring Reserve | 9 | 9 | 9 | 0
Current Year Actions [Member] | Cost of Sales [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 4 |  | 25 |
Current Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 61 |  | 76 |
Current Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 25 |  | 25 |
Costs Incurred | (2) | (20) |  |
Remaining Costs | 3 |  | 3 |
Current Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 62 |  | 62 |
Costs Incurred | (3) | (16) |  |
Remaining Costs | 43 |  | 43 |
Current Year Actions [Member] | Eliminations and other [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 60 |  | 60 |
Costs Incurred | (60) | 0 |  |
Remaining Costs | 0 |  | 0 |
Prior Year Actions [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | (24) |  | (20) |
Utilization, foreign exchange and other costs | (59) |  | (194) |
Restructuring Reserve | 126 | 209 | 126 | 340
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 759 |  | 759 |
Costs Incurred | 24 | (4) |  | (770)
Remaining Costs | 9 |  | 9 |
Prior Year Actions [Member] | Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | (27) |  | (26) |
Utilization, foreign exchange and other costs | (105) |  | (235) |
Restructuring Reserve | 73 | 205 | 73 | 334
Prior Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 3 |  | 6 |
Utilization, foreign exchange and other costs | 46 |  | 41 |
Restructuring Reserve | 53 | 4 | 53 | 6
Prior Year Actions [Member] | Cost of Sales [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | (6) |  | (8) |
Prior Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | (18) |  | (12) |
Prior Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 188 |  | 188 |
Costs Incurred | 17 | 0 |  | (205)
Remaining Costs | 0 |  | 0 |
Prior Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 334 |  | 334 |
Costs Incurred | 7 | 1 |  | (333)
Remaining Costs | 9 |  | 9 |
Prior Year Actions [Member] | Eliminations and other [Member] |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |
Expected Costs | 237 |  | 237 |
Costs Incurred | 0 | $ (5) |  | $ (232)
Remaining Costs | 0 |  | 0 |
Two Years Prior Actions [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net pre-tax restructuring costs | 15 |  | 18 |
Restructuring Reserve | $ 31 |  | $ 31 |

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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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