Segment Financial Data (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,251	$ 11,360
Product [Member]
Segment Reporting Information [Line Items]
Revenues	11,664	8,165
Service [Member]
Segment Reporting Information [Line Items]
Revenues	3,587	3,195
U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	7,748	2,528
Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	1,295	326
Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	1,180	363
Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	5,028	8,143
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	9,730	5,504
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	1,772	2,025
Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	992	315
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	2,147	2,762
Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	610	754
Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,370	6,438
Collins Aerospace Systems [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,182	4,905
Collins Aerospace Systems [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	856	1,103
Collins Aerospace Systems [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,222	1,289
Collins Aerospace Systems [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	40	55
Collins Aerospace Systems [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	245	225
Collins Aerospace Systems [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,531	4,439
Collins Aerospace Systems [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,242	3,144
Collins Aerospace Systems [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	405	604
Collins Aerospace Systems [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	95	143
Collins Aerospace Systems [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	1,079	1,745
Collins Aerospace Systems [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	217	372
Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,030	5,353
Pratt & Whitney [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,423	3,255
Pratt & Whitney [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	1,607	2,092
Pratt & Whitney [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	1,262	1,239
Pratt & Whitney [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	242	271
Pratt & Whitney [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	139	138
Pratt & Whitney [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	2,387	3,699
Pratt & Whitney [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,159	2,355
Pratt & Whitney [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	793	1,421
Pratt & Whitney [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	104	172
Pratt & Whitney [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	626	1,017
Pratt & Whitney [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	348	382
Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,765	0
Raytheon Intelligence & Space [Member] | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	1,471
Raytheon Intelligence & Space [Member] | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,974
Raytheon Intelligence & Space [Member] | Product [Member]
Segment Reporting Information [Line Items]
Revenues	2,676	0
Raytheon Intelligence & Space [Member] | Service [Member]
Segment Reporting Information [Line Items]
Revenues	769	0
Raytheon Intelligence & Space [Member] | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,900	0
Raytheon Intelligence & Space [Member] | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	208	0
Raytheon Intelligence & Space [Member] | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	229	0
Raytheon Intelligence & Space [Member] | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	108	0
Raytheon Intelligence & Space [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,965	0
Raytheon Intelligence & Space [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	204	0
Raytheon Intelligence & Space [Member] | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	133	0
Raytheon Intelligence & Space [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	114	0
Raytheon Intelligence & Space [Member] | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	29	0
Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,793	0
Raytheon Missiles & Defense | Fixed-price Contract
Segment Reporting Information [Line Items]
Revenues	2,251
Raytheon Missiles & Defense | Cost-type Contract
Segment Reporting Information [Line Items]
Revenues	1,479
Raytheon Missiles & Defense | Product [Member]
Segment Reporting Information [Line Items]
Revenues	3,375	0
Raytheon Missiles & Defense | Service [Member]
Segment Reporting Information [Line Items]
Revenues	355	0
Raytheon Missiles & Defense | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	2,357	0
Raytheon Missiles & Defense | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	805	0
Raytheon Missiles & Defense | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	567	0
Raytheon Missiles & Defense | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	1	0
Raytheon Missiles & Defense | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	2,357	0
Raytheon Missiles & Defense | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	370	0
Raytheon Missiles & Defense | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	660	0
Raytheon Missiles & Defense | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	327	0
Raytheon Missiles & Defense | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	16	0
Other Segments
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | Product [Member]
Segment Reporting Information [Line Items]
Revenues	8	5
Other Segments | Service [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | U.S. Government Sales Excluding Foreign Military Sales Member
Segment Reporting Information [Line Items]
Revenues	7	0
Other Segments | Foreign Military Sales Through the U.S. Government Member
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | Foreign Government Direct Commercial Sales Member
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | Commercial Aerospace and Other Commercial Member
Segment Reporting Information [Line Items]
Revenues	1	5
Other Segments | UNITED STATES
Segment Reporting Information [Line Items]
Revenues	7	5
Other Segments | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | Middle East and North Africa Member
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	1	0
Other Segments | Canada and All Other [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,958	11,791
Operating Segments | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	4,038	6,008
Operating Segments | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	4,030	5,347
Operating Segments | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	3,445	0
Operating Segments | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	3,730	0
Operating Segments | Other Segments
Segment Reporting Information [Line Items]
Revenues	8	5
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(707)	(431)
Intersegment Eliminations | Collins Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Revenues	332	430
Intersegment Eliminations | Pratt & Whitney [Member]
Segment Reporting Information [Line Items]
Revenues	0	6
Intersegment Eliminations | Raytheon Intelligence & Space [Member]
Segment Reporting Information [Line Items]
Revenues	320	0
Intersegment Eliminations | Raytheon Missiles & Defense
Segment Reporting Information [Line Items]
Revenues	63	0
Intersegment Eliminations | Other Segments
Segment Reporting Information [Line Items]
Revenues	$ (715)	$ (436)