Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2023	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 20,000		$ 20,000
Foreign Derived Intangible Income (FDII)			(142)	$ (214)	$ (121)
Effective Income Tax Reconciliation, Reorganization, Amount				207	244
U.S. research and development credit			168	164	172
Effective Income Tax Rate Reconciliation, Change in U.K. Enacted Tax Rate, Amount			0	0	73
State income tax, net			17	59	174
Disposals of businesses			0	0	108
Unrecognized Tax Benefits	1,442		1,442	1,515	1,458	$ 1,225
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,313		1,313
Income Tax Expense (Benefit)			(456)	$ (790)	$ (964)
RTX 2019 Tax Year Statute Lapse
Income Tax Contingency [Line Items]
Tax audit settlements	53
Income Tax Expense (Benefit)	59
Minimum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	300		300
Maximum [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 450		$ 450
Forecast [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Tax audit settlements		$ 225
Forecast [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Tax audit settlements		$ 305