Segment Information (Details 1) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Number of reportable segments									3
Total sales	$ 6,397	$ 6,155	$ 6,000	$ 5,956	$ 5,694	$ 5,979	$ 5,896	$ 5,957	$ 24,508	$ 23,526	$ 23,979
Operating income	$ 831	$ 826	$ 797	$ 739	$ 689	$ 794	$ 813	$ 780	3,193	3,076	3,196
Benefit from claimed state refund									35
Benefit from overhead claim recoveries									25
Expense recognized due to change in accounting methods									45	21
Expense recognized from a discretionary pension contribution									25
Operating Segments
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									2,935	2,920	3,099
Operating Segments | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									10,828	9,940	9,910
Operating income									1,236	1,205	1,285
Operating Segments | MIssion Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									10,928	10,674	11,001
Operating income									1,445	1,410	1,557
Operating Segments | Technology Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									4,825	4,819	4,902
Operating income									512	514	461
Intersegment Eliminations [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									2,073	1,907	1,834
Operating income									258	209	204
Intersegment Eliminations [Member] | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									239	221	166
Operating income									28	27	21
Intersegment Eliminations [Member] | MIssion Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									875	781	842
Operating income									136	97	115
Intersegment Eliminations [Member] | Technology Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									959	905	826
Operating income									94	85	68
Net FAS/CAS pension adjustment Income (Expense) [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									316	348	269
Corporate, Non-Segment [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									(53)	(190)	(169)
Segment Reconciling Items [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									$ (5)	$ (2)	$ (3)