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Restructuring Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | $ 19 |  |  | $ 118 |
Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 4 |  |  | 25 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 15 |  |  | 93 |
Pratt & Whitney [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 2 |  |  | 6 |
Collins Aerospace Systems [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 2 |  |  | 32 |
Eliminations and other [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 15 |  |  | 80 |
Current Year Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 12 |  |  | 113 |
Utilization, foreign exchange and other costs |  |  |  | (37) |
Restructuring Reserve | 76 |  |  | 76 | $ 0
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 187 |  |  | 187 |
Costs Incurred | (12) | $ (65) | $ (36) |  |
Remaining Costs | 74 |  |  | 74 |
Current Year Actions [Member] | Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 7 |  |  | 32 |
Current Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 5 |  |  | 81 |
Current Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 58 |  |  | 58 |
Costs Incurred | (1) | (2) | (20) |  |
Remaining Costs | 35 |  |  | 35 |
Current Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 67 |  |  | 67 |
Costs Incurred | (9) | (3) | (16) |  |
Remaining Costs | 39 |  |  | 39 |
Current Year Actions [Member] | Eliminations and other [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 62 |  |  | 62 |
Costs Incurred | (2) | (60) | 0 |  |
Remaining Costs | 0 |  |  | 0 |
Prior Year Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 1 |  |  | (19) |
Utilization, foreign exchange and other costs |  |  |  | (245) |
Restructuring Reserve | 76 |  |  | 76 | 340
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 758 |  |  | 758 |
Costs Incurred | (1) | 24 | (4) |  | (770)
Remaining Costs | 7 |  |  | 7 |
Prior Year Actions [Member] | Cost of Sales [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | (6) |  |  | (14) |
Prior Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 7 |  |  | (5) |
Prior Year Actions [Member] | Pratt & Whitney [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 188 |  |  | 188 |
Costs Incurred | 0 | 17 | 0 |  | (205)
Remaining Costs | 0 |  |  | 0 |
Prior Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 320 |  |  | 320 |
Costs Incurred | 12 | 7 | 1 |  | (333)
Remaining Costs | 7 |  |  | 7 |
Prior Year Actions [Member] | Eliminations and other [Member] |  |  |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |  |  |
Expected Costs | 250 |  |  | 250 |
Costs Incurred | (13) | $ 0 | $ (5) |  | $ (232)
Remaining Costs | 0 |  |  | 0 |
Two Years Prior Actions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net pre-tax restructuring costs | 6 |  |  | 24 |
Restructuring Reserve | $ 28 |  |  | $ 28 |

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