Segment Financial Data (Capital Expenditures and Depreciation & Amortization) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Capital Expenditures	$ 749	$ 614	$ 1,964	$ 1,657
Depreciation & Amortization	1,068	1,091	3,218	3,219
Operating segments
Segment Reporting [Line Items]
Capital Expenditures	645	555	1,751	1,529
Depreciation & Amortization	555	542	1,680	1,633
Operating segments \| Collins Aerospace
Segment Reporting [Line Items]
Capital Expenditures	217	191	591	474
Depreciation & Amortization	215	215	677	652
Operating segments \| Pratt & Whitney
Segment Reporting [Line Items]
Capital Expenditures	268	236	635	568
Depreciation & Amortization	201	189	605	577
Operating segments \| Raytheon
Segment Reporting [Line Items]
Capital Expenditures	160	128	525	487
Depreciation & Amortization	139	138	398	404
Corporate, eliminations, and other
Segment Reporting [Line Items]
Capital Expenditures	104	59	213	128
Depreciation & Amortization	25	23	74	65
Segment reconciling items \| Acquisition accounting adjustments
Segment Reporting [Line Items]
Depreciation & Amortization	$ 488	$ 526	$ 1,464	$ 1,521