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Information on Business Segments - Income Statement Information For Each Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 14,411	$ 14,318	$ 13,398	$ 11,635	$ 13,844	$ 12,341	$ 12,563	$ 11,212	$ 53,762	$ 49,960	$ 47,290
Aeronautics
Segment Reporting Information [Line Items]
Net sales									21,242	19,410	17,293
MFC
Segment Reporting Information [Line Items]
Net sales									8,462	7,282	6,789
RMS
Segment Reporting Information [Line Items]
Net sales									14,250	13,663	13,595
Space
Segment Reporting Information [Line Items]
Net sales									9,808	9,605	9,613
United States
Segment Reporting Information [Line Items]
Net sales									38,606	35,626	34,611
United States | Aeronautics
Segment Reporting Information [Line Items]
Net sales									13,507	12,769	11,468
United States | MFC
Segment Reporting Information [Line Items]
Net sales									6,272	4,610	4,445
United States | RMS
Segment Reporting Information [Line Items]
Net sales									10,557	10,088	9,804
United States | Space
Segment Reporting Information [Line Items]
Net sales									8,270	8,159	8,894
Asia Pacific
Segment Reporting Information [Line Items]
Net sales									5,280	4,775	3,710
Asia Pacific | Aeronautics
Segment Reporting Information [Line Items]
Net sales									3,335	2,823	2,077
Asia Pacific | MFC
Segment Reporting Information [Line Items]
Net sales									427	516	341
Asia Pacific | RMS
Segment Reporting Information [Line Items]
Net sales									1,433	1,344	1,194
Asia Pacific | Space
Segment Reporting Information [Line Items]
Net sales									85	92	98
Europe
Segment Reporting Information [Line Items]
Net sales									5,403	4,833	3,777
Europe | Aeronautics
Segment Reporting Information [Line Items]
Net sales									2,837	2,331	2,020
Europe | MFC
Segment Reporting Information [Line Items]
Net sales									321	305	237
Europe | RMS
Segment Reporting Information [Line Items]
Net sales									829	927	1,045
Europe | Space
Segment Reporting Information [Line Items]
Net sales									1,416	1,270	475
Middle East
Segment Reporting Information [Line Items]
Net sales									3,602	3,767	3,737
Middle East | Aeronautics
Segment Reporting Information [Line Items]
Net sales									1,380	1,316	1,423
Middle East | MFC
Segment Reporting Information [Line Items]
Net sales									1,404	1,798	1,739
Middle East | RMS
Segment Reporting Information [Line Items]
Net sales									781	572	429
Middle East | Space
Segment Reporting Information [Line Items]
Net sales									37	81	146
Other
Segment Reporting Information [Line Items]
Net sales									871	959	1,455
Other | Aeronautics
Segment Reporting Information [Line Items]
Net sales									183	171	305
Other | MFC
Segment Reporting Information [Line Items]
Net sales									38	53	27
Other | RMS
Segment Reporting Information [Line Items]
Net sales									650	732	1,123
Other | Space
Segment Reporting Information [Line Items]
Net sales									0	3	0
U.S. Government
Segment Reporting Information [Line Items]
Net sales									37,716	34,879	33,435
U.S. Government | Aeronautics
Segment Reporting Information [Line Items]
Net sales									13,321	12,609	11,265
U.S. Government | MFC
Segment Reporting Information [Line Items]
Net sales									6,088	4,467	4,304
U.S. Government | RMS
Segment Reporting Information [Line Items]
Net sales									10,083	9,715	9,350
U.S. Government | Space
Segment Reporting Information [Line Items]
Net sales									8,224	8,088	8,516
International
Segment Reporting Information [Line Items]
Net sales									15,156	14,334	12,679
International | Aeronautics
Segment Reporting Information [Line Items]
Net sales									7,735	6,641	5,825
International | MFC
Segment Reporting Information [Line Items]
Net sales									2,190	2,672	2,344
International | RMS
Segment Reporting Information [Line Items]
Net sales									3,693	3,575	3,791
International | Space
Segment Reporting Information [Line Items]
Net sales									1,538	1,446	719
U.S. Commercial and Other
Segment Reporting Information [Line Items]
Net sales									890	747	1,176
U.S. Commercial and Other | Aeronautics
Segment Reporting Information [Line Items]
Net sales									186	160	203
U.S. Commercial and Other | MFC
Segment Reporting Information [Line Items]
Net sales									184	143	141
U.S. Commercial and Other | RMS
Segment Reporting Information [Line Items]
Net sales									474	373	454
U.S. Commercial and Other | Space
Segment Reporting Information [Line Items]
Net sales									46	71	378
Fixed-price
Segment Reporting Information [Line Items]
Net sales									33,239	31,047	29,047
Fixed-price | Aeronautics
Segment Reporting Information [Line Items]
Net sales									15,719	13,828	11,926
Fixed-price | MFC
Segment Reporting Information [Line Items]
Net sales									5,653	5,102	4,926
Fixed-price | RMS
Segment Reporting Information [Line Items]
Net sales									9,975	10,059	9,871
Fixed-price | Space
Segment Reporting Information [Line Items]
Net sales									1,892	2,058	2,324
Cost-reimbursable
Segment Reporting Information [Line Items]
Net sales									20,523	18,913	18,243
Cost-reimbursable | Aeronautics
Segment Reporting Information [Line Items]
Net sales									5,523	5,582	5,367
Cost-reimbursable | MFC
Segment Reporting Information [Line Items]
Net sales									2,809	2,180	1,863
Cost-reimbursable | RMS
Segment Reporting Information [Line Items]
Net sales									4,275	3,604	3,724
Cost-reimbursable | Space
Segment Reporting Information [Line Items]
Net sales									7,916	7,547	7,289
Products
Segment Reporting Information [Line Items]
Net sales									45,005	42,502	40,081
Products | Aeronautics
Segment Reporting Information [Line Items]
Net sales									18,207	16,981	15,066
Products | MFC
Segment Reporting Information [Line Items]
Net sales									6,945	5,940	5,602
Products | RMS
Segment Reporting Information [Line Items]
Net sales									11,714	11,398	11,401
Products | Space
Segment Reporting Information [Line Items]
Net sales									8,139	8,183	8,012
Services
Segment Reporting Information [Line Items]
Net sales									8,757	7,458	7,209
Services | Aeronautics
Segment Reporting Information [Line Items]
Net sales									3,035	2,429	2,227
Services | MFC
Segment Reporting Information [Line Items]
Net sales									1,517	1,342	1,187
Services | RMS
Segment Reporting Information [Line Items]
Net sales									2,536	2,265	2,194
Services | Space
Segment Reporting Information [Line Items]
Net sales									$ 1,669	$ 1,422	$ 1,601

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