Segment Information (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 920	$ 471	$ 561
Depreciation and Amortization	456	467	462
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	451	237	376
Depreciation and Amortization	216	215	208
Mission Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	372	141	131
Depreciation and Amortization	140	153	158
Technology Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	6	3	3
Depreciation and Amortization	37	36	36
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	91	90	51
Depreciation and Amortization	$ 63	$ 63	$ 60