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Restructuring Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | $ 43 |  |
Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 20 |  |
Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 23 |  |
Pratt & Whitney [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 20 |  |
Collins Aerospace Systems [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 18 |  |
Eliminations and other [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 5 |  |
Current Year Actions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 36 |  |
Utilization, foreign exchange and other costs | (4) |  |
Restructuring Reserve | 32 |  | $ 0
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 69 |  |
Costs Incurred |  | $ (36) |
Remaining Costs | 33 |  |
Current Year Actions [Member] | Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 24 |  |
Utilization, foreign exchange and other costs | (1) |  |
Restructuring Reserve | 23 |  | 0
Current Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 12 |  |
Utilization, foreign exchange and other costs | (3) |  |
Restructuring Reserve | 9 |  | 0
Current Year Actions [Member] | Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 21 |  |
Current Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 15 |  |
Current Year Actions [Member] | Pratt & Whitney [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 20 |  |
Costs Incurred |  | (20) |
Remaining Costs | 0 |  |
Current Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 49 |  |
Costs Incurred |  | (16) |
Remaining Costs | 33 |  |
Current Year Actions [Member] | Eliminations and other [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 0 |  |
Costs Incurred |  | $ 0 |
Remaining Costs | 0 |  |
Prior Year Actions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 4 |  |
Utilization, foreign exchange and other costs | (135) |  |
Restructuring Reserve | 209 |  | 340
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 782 |  |
Costs Incurred | (4) |  | (770)
Remaining Costs | 8 |  |
Prior Year Actions [Member] | Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 1 |  |
Utilization, foreign exchange and other costs | (130) |  |
Restructuring Reserve | 205 |  | 334
Prior Year Actions [Member] | Facility Exit, Lease Termination and Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 3 |  |
Utilization, foreign exchange and other costs | (5) |  |
Restructuring Reserve | 4 |  | 6
Prior Year Actions [Member] | Cost of Sales [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | (2) |  |
Prior Year Actions [Member] | Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 6 |  |
Prior Year Actions [Member] | Pratt & Whitney [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 205 |  |
Costs Incurred | 0 |  | (205)
Remaining Costs | 0 |  |
Prior Year Actions [Member] | Collins Aerospace Systems [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 340 |  |
Costs Incurred | 1 |  | (333)
Remaining Costs | 8 |  |
Prior Year Actions [Member] | Eliminations and other [Member] |  |  |
Restructuring and Related Cost, Expected Cost [Abstract] |  |  |
Expected Costs | 237 |  |
Costs Incurred | (5) |  | $ (232)
Remaining Costs | 0 |  |
Two Years Prior Actions [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 3 |  |
Restructuring Reserve | $ 32 |  |

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