Segment Information (Details 7) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 1,249	$ 928	$ 920
Depreciation and amortization	800	475	456
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	781	665	451
Depreciation and amortization	243	234	216
Innovation Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	141	0	0
Depreciation and amortization	84	0	0
Mission Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	206	164	372
Depreciation and amortization	134	131	140
Technology Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	18	15	6
Depreciation and amortization	45	40	37
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	103	84	91
Depreciation and amortization	$ 294	$ 70	$ 63