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Business Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 4,229	$ 4,463	$ 13,464	$ 13,534
Intersegment
Disaggregation of Revenue [Line Items]
Revenue	(46)	(44)	(141)	(132)
Integrated Mission Systems | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,336	1,372	4,281	4,073
Integrated Mission Systems | Transferred over time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue	16	12	45	37
Integrated Mission Systems | Transferred over time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,016	1,086	3,070	3,205
Integrated Mission Systems | Transferred over time | International
Disaggregation of Revenue [Line Items]
Revenue	304	274	1,166	831
Integrated Mission Systems | Transferred over time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	988	1,039	3,227	3,060
Integrated Mission Systems | Transferred over time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	332	321	1,009	976
Integrated Mission Systems | Transferred over time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	906	908	2,933	2,715
Integrated Mission Systems | Transferred over time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	414	452	1,303	1,321
Space and Airborne Systems | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,284	1,249	3,807	3,690
Space and Airborne Systems | Transferred over time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue	4	5	8	11
Space and Airborne Systems | Transferred over time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,122	1,064	3,284	3,114
Space and Airborne Systems | Transferred over time | International
Disaggregation of Revenue [Line Items]
Revenue	158	180	515	565
Space and Airborne Systems | Transferred over time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	717	702	2,172	2,072
Space and Airborne Systems | Transferred over time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	563	542	1,627	1,607
Space and Airborne Systems | Transferred over time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	753	674	2,169	2,006
Space and Airborne Systems | Transferred over time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	527	570	1,630	1,673
Communication Systems | Transferred at point in time and over time
Disaggregation of Revenue [Line Items]
Revenue	1,030	1,094	3,269	3,300
Communication Systems | Transferred at point in time and over time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue	15	9	40	27
Communication Systems | Transferred at point in time and over time | United States
Disaggregation of Revenue [Line Items]
Revenue	719	745	2,337	2,410
Communication Systems | Transferred at point in time and over time | International
Disaggregation of Revenue [Line Items]
Revenue	296	340	892	863
Communication Systems | Transferred at point in time and over time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	871	931	2,765	2,790
Communication Systems | Transferred at point in time and over time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	144	154	464	483
Communication Systems | Transferred at point in time and over time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	681	760	2,193	2,249
Communication Systems | Transferred at point in time and over time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	334	325	1,036	1,024
Aviation Systems | Transferred at point in time and over time
Disaggregation of Revenue [Line Items]
Revenue	625	792	2,248	2,603
Aviation Systems | Transferred at point in time and over time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue	11	18	48	57
Aviation Systems | Transferred at point in time and over time | United States
Disaggregation of Revenue [Line Items]
Revenue	530	669	1,891	2,076
Aviation Systems | Transferred at point in time and over time | International
Disaggregation of Revenue [Line Items]
Revenue	84	105	309	470
Aviation Systems | Transferred at point in time and over time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	506	630	1,786	2,069
Aviation Systems | Transferred at point in time and over time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	108	144	414	477
Aviation Systems | Transferred at point in time and over time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	383	511	1,439	1,688
Aviation Systems | Transferred at point in time and over time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 231	$ 263	$ 761	$ 858

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