Segment Financial Data (Capital Expenditures and Depreciation & Amortization) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Capital Expenditures	$ 513	$ 467
Depreciation & Amortization	1,052	1,059
Operating segments
Segment Reporting Information [Line Items]
Capital Expenditures	490	455
Depreciation & Amortization	542	523
Operating segments | Collins Aerospace Systems
Segment Reporting Information [Line Items]
Capital Expenditures	112	125
Depreciation & Amortization	217	203
Operating segments | Pratt & Whitney
Segment Reporting Information [Line Items]
Capital Expenditures	153	139
Depreciation & Amortization	194	193
Operating segments | Raytheon
Segment Reporting Information [Line Items]
Capital Expenditures	225	191
Depreciation & Amortization	131	127
Corporate, eliminations, and other
Segment Reporting Information [Line Items]
Capital Expenditures	23	12
Depreciation & Amortization	21	18
Segment reconciling items | Acquisition accounting adjustments
Segment Reporting Information [Line Items]
Depreciation & Amortization	$ 489	$ 518