Segment Financial Data (Segment Operating Performance) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 13,464	$ 16,951	$ 48,993	$ 48,981
Operating profit (loss)	$ (1,396)	$ 1,520	$ 1,784	$ 4,013
Operating Profit Margin	(10.40%)	9.00%	3.60%	8.20%
Total assets	$ 162,443		$ 162,443		$ 158,864
Operating Segments
Segment Reporting Information [Line Items]
Revenues	14,027	$ 17,406	50,454	$ 50,214
Operating profit (loss)	$ (1,019)	$ 1,744	$ 2,637	$ 4,662
Operating Profit Margin	(7.30%)	10.00%	5.20%	9.30%
Total assets	$ 157,700		$ 157,700		152,275
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(563)	$ (455)	(1,461)	$ (1,233)
Operating profit (loss)	(69)	(13)	(34)	(25)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating profit (loss)	(63)	(77)	(165)	(255)
Total assets	4,743		4,743		6,589
Collins Aerospace [Member] \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	6,629	5,718	19,133	16,821
Operating profit (loss)	$ 903	$ 742	$ 2,699	$ 1,973
Operating Profit Margin	13.60%	13.00%	14.10%	11.70%
Total assets	$ 72,006		$ 72,006		70,404
Pratt & Whitney [Member] \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	926	$ 5,380	11,857	$ 14,878
Operating profit (loss)	$ (2,482)	$ 316	$ (1,837)	$ 769
Operating Profit Margin	(268.00%)	5.90%	(15.50%)	5.20%
Total assets	$ 39,619		$ 39,619		36,205
Raytheon \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	6,472	$ 6,308	19,464	$ 18,515
Operating profit (loss)	$ 560	$ 686	$ 1,775	$ 1,920
Operating Profit Margin	8.70%	10.90%	9.10%	10.40%
Total assets	$ 46,075		$ 46,075		$ 45,666
FAS/CAS Operating Adjustment \| Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	$ 0	0	$ 0
Operating profit (loss)	272	348	845	1,045
Acquisition accounting adjustment member \| Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating profit (loss)	$ (517)	$ (482)	$ (1,499)	$ (1,414)