Segment Financial Data (Capital Expenditures and Depreciation & Amortization) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Capital Expenditures	$ 669	$ 530	$ 1,215	$ 1,043
Depreciation & Amortization	1,079	1,076	2,150	2,128
Operating segments
Segment Reporting [Line Items]
Capital Expenditures	606	485	1,106	975
Depreciation & Amortization	566	549	1,125	1,091
Operating segments \| Collins Aerospace
Segment Reporting [Line Items]
Capital Expenditures	219	171	374	283
Depreciation & Amortization	230	220	462	437
Operating segments \| Pratt & Whitney
Segment Reporting [Line Items]
Capital Expenditures	193	180	367	333
Depreciation & Amortization	203	194	404	388
Operating segments \| Raytheon
Segment Reporting [Line Items]
Capital Expenditures	194	134	365	359
Depreciation & Amortization	133	135	259	266
Corporate, eliminations, and other
Segment Reporting [Line Items]
Capital Expenditures	63	45	109	68
Depreciation & Amortization	25	21	49	42
Segment reconciling items \| Acquisition accounting adjustments
Segment Reporting [Line Items]
Depreciation & Amortization	$ 488	$ 506	$ 976	$ 995