Restructuring Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	$ 143
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	34
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	109
Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	137
Utilization and foreign exchange	(50)
Restructuring Reserve	87
Expected Costs	199
Restructuring cost incurred	(137)
Remaining Costs	62
Current Year Actions [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	40
Current Year Actions [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	97
Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	(23)
Utilization and foreign exchange	(267)
Restructuring Reserve	50	$ 340
Expected Costs	751
Restructuring cost incurred	23	(770)
Remaining Costs	4
Prior Year Actions [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	14
Prior Year Actions [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	9
Two Years Prior Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	29
Restructuring Reserve	25
Pratt and Whitney [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	7
Pratt and Whitney [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	60
Restructuring cost incurred	(24)
Remaining Costs	36
Pratt and Whitney [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	188
Restructuring cost incurred	17	(205)
Remaining Costs	0
Collins Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	40
Collins Aerospace Systems [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	62
Restructuring cost incurred	(36)
Remaining Costs	26
Collins Aerospace Systems [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	312
Restructuring cost incurred	25	(333)
Remaining Costs	4
Eliminations and other [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (benefit)	96
Eliminations and other [Member] | Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	77
Restructuring cost incurred	(77)
Remaining Costs	0
Eliminations and other [Member] | Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Expected Costs	251
Restructuring cost incurred	(19)	$ (232)
Remaining Costs	$ 0