Segment Financial Data (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Net sales	$ 16,419	$ 14,747	$ 14,061	$ 11,360	$ 11,694	$ 11,373	$ 11,329	$ 10,953	$ 56,587	$ 45,349	$ 34,701
U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									25,962	9,094	6,560
Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									4,585	1,571	902
Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									3,974	1,498	1,275
Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									22,066	33,186	25,964
Airbus [Member]
Revenue from External Customer [Line Items]
Net sales									7,299	9,879	10,025
Operating Segments
Revenue from External Customer [Line Items]
Net sales									58,588	46,930	36,036
Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									(2,001)	(1,581)	(1,335)
UNITED STATES
Revenue from External Customer [Line Items]
Net sales									34,560	21,397	15,666
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									7,644	7,935	6,637
Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									3,443	1,530	882
Europe [Member]
Revenue from External Customer [Line Items]
Net sales									8,856	11,378	9,531
Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									2,084	3,109	1,985
Product [Member]
Revenue from External Customer [Line Items]
Net sales									43,319	32,998	24,141
Service [Member]
Revenue from External Customer [Line Items]
Net sales									13,268	12,351	10,560
Collins Aerospace Systems [Member]
Revenue from External Customer [Line Items]
Net sales									19,288	26,028	16,634
Collins Aerospace Systems [Member] | U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									5,159	4,781	2,643
Collins Aerospace Systems [Member] | Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									218	255	195
Collins Aerospace Systems [Member] | Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									923	937	737
Collins Aerospace Systems [Member] | Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									11,610	18,458	11,710
Collins Aerospace Systems [Member] | Operating Segments
Revenue from External Customer [Line Items]
Net sales									17,910	24,431	15,285
Collins Aerospace Systems [Member] | Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									1,378	1,597	1,349
Collins Aerospace Systems [Member] | UNITED STATES
Revenue from External Customer [Line Items]
Net sales									10,132	12,762	7,079
Collins Aerospace Systems [Member] | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									1,810	2,473	1,525
Collins Aerospace Systems [Member] | Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									421	693	425
Collins Aerospace Systems [Member] | Europe [Member]
Revenue from External Customer [Line Items]
Net sales									4,643	7,051	5,508
Collins Aerospace Systems [Member] | Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									904	1,452	748
Collins Aerospace Systems [Member] | Product [Member]
Revenue from External Customer [Line Items]
Net sales									14,664	19,991	12,708
Collins Aerospace Systems [Member] | Service [Member]
Revenue from External Customer [Line Items]
Net sales									3,246	4,440	2,577
Pratt and Whitney [Member]
Revenue from External Customer [Line Items]
Net sales									16,799	20,902	19,402
Pratt and Whitney [Member] | U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									5,193	4,313	3,917
Pratt and Whitney [Member] | Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									1,229	1,316	707
Pratt and Whitney [Member] | Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									583	561	538
Pratt and Whitney [Member] | Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									9,785	14,715	14,242
Pratt and Whitney [Member] | Operating Segments
Revenue from External Customer [Line Items]
Net sales									16,790	20,905	19,404
Pratt and Whitney [Member] | Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									9	(3)	(2)
Pratt and Whitney [Member] | UNITED STATES
Revenue from External Customer [Line Items]
Net sales									8,534	8,622	8,575
Pratt and Whitney [Member] | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									4,024	5,462	5,112
Pratt and Whitney [Member] | Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									505	837	457
Pratt and Whitney [Member] | Europe [Member]
Revenue from External Customer [Line Items]
Net sales									2,726	4,327	4,023
Pratt and Whitney [Member] | Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									1,001	1,657	1,237
Pratt and Whitney [Member] | Product [Member]
Revenue from External Customer [Line Items]
Net sales									10,186	12,994	11,421
Pratt and Whitney [Member] | Service [Member]
Revenue from External Customer [Line Items]
Net sales									6,604	7,911	7,983
Raytheon Intelligence & Space
Revenue from External Customer [Line Items]
Net sales									10,841	0	0
Raytheon Intelligence & Space | Fixed-price Contract
Revenue from External Customer [Line Items]
Net sales									4,319
Raytheon Intelligence & Space | Time-and-materials Contract
Revenue from External Customer [Line Items]
Net sales									5,560
Raytheon Intelligence & Space | U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									8,309	0	0
Raytheon Intelligence & Space | Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									593	0	0
Raytheon Intelligence & Space | Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									729	0	0
Raytheon Intelligence & Space | Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									248	0	0
Raytheon Intelligence & Space | Operating Segments
Revenue from External Customer [Line Items]
Net sales									9,879	0	0
Raytheon Intelligence & Space | Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									962	0	0
Raytheon Intelligence & Space | UNITED STATES
Revenue from External Customer [Line Items]
Net sales									8,500	0	0
Raytheon Intelligence & Space | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									613	0	0
Raytheon Intelligence & Space | Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									376	0	0
Raytheon Intelligence & Space | Europe [Member]
Revenue from External Customer [Line Items]
Net sales									307	0	0
Raytheon Intelligence & Space | Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									83	0	0
Raytheon Intelligence & Space | Product [Member]
Revenue from External Customer [Line Items]
Net sales									7,531	0	0
Raytheon Intelligence & Space | Service [Member]
Revenue from External Customer [Line Items]
Net sales									2,348	0	0
Raytheon Missiles & Defense
Revenue from External Customer [Line Items]
Net sales									11,660	0	0
Raytheon Missiles & Defense | Fixed-price Contract
Revenue from External Customer [Line Items]
Net sales									7,287
Raytheon Missiles & Defense | Time-and-materials Contract
Revenue from External Customer [Line Items]
Net sales									4,194
Raytheon Missiles & Defense | U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									7,099	0	0
Raytheon Missiles & Defense | Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									2,545	0	0
Raytheon Missiles & Defense | Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									1,736	0	0
Raytheon Missiles & Defense | Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									101	0	0
Raytheon Missiles & Defense | Operating Segments
Revenue from External Customer [Line Items]
Net sales									11,481	0	0
Raytheon Missiles & Defense | Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									179	0	0
Raytheon Missiles & Defense | UNITED STATES
Revenue from External Customer [Line Items]
Net sales									7,110	0	0
Raytheon Missiles & Defense | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									1,156	0	0
Raytheon Missiles & Defense | Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									2,111	0	0
Raytheon Missiles & Defense | Europe [Member]
Revenue from External Customer [Line Items]
Net sales									1,031	0	0
Raytheon Missiles & Defense | Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									73	0	0
Raytheon Missiles & Defense | Product [Member]
Revenue from External Customer [Line Items]
Net sales									10,476	0	0
Raytheon Missiles & Defense | Service [Member]
Revenue from External Customer [Line Items]
Net sales									1,005	0	0
Other Segments [Member]
Revenue from External Customer [Line Items]
Net sales									0	0	0
Other Segments [Member] | U S Government Sales Excluding Foreign Military Sales
Revenue from External Customer [Line Items]
Net sales									202	0	0
Other Segments [Member] | Foreign Military Sales Through The U S Government
Revenue from External Customer [Line Items]
Net sales									0	0	0
Other Segments [Member] | Foreign Government Direct Commercial Sales
Revenue from External Customer [Line Items]
Net sales									3	0	0
Other Segments [Member] | Commercial Aerospace And Other Commercial
Revenue from External Customer [Line Items]
Net sales									322	13	12
Other Segments [Member] | Operating Segments
Revenue from External Customer [Line Items]
Net sales									527	13	12
Other Segments [Member] | Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									(2,528)	(1,594)	(1,347)
Other Segments [Member] | UNITED STATES
Revenue from External Customer [Line Items]
Net sales									284	13	12
Other Segments [Member] | Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net sales									41	0	0
Other Segments [Member] | Middle East And North Africa
Revenue from External Customer [Line Items]
Net sales									30	0	0
Other Segments [Member] | Europe [Member]
Revenue from External Customer [Line Items]
Net sales									149	0	0
Other Segments [Member] | Other Geographic Regions [Member]
Revenue from External Customer [Line Items]
Net sales									23	0	0
Other Segments [Member] | Product [Member]
Revenue from External Customer [Line Items]
Net sales									462	13	12
Other Segments [Member] | Service [Member]
Revenue from External Customer [Line Items]
Net sales									$ 65	$ 0	$ 0