Segment Information Capital Expenditures and Depreciation and Amortization (Details 7) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	$ 1,264	$ 1,249	$ 928
Depreciation and amortization	1,018	800	475
Aerospace Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	650	781	665
Depreciation and amortization	262	243	234
Innovation Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	271	141	0
Depreciation and amortization	173	84	0
Mission Systems
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	244	206	164
Depreciation and amortization	146	134	131
Technology Services
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	15	18	15
Depreciation and amortization	9	45	40
Corporate
Additional information by Segment (Table Amounts) [Abstract]
Capital Expenditures	84	103	84
Depreciation and amortization	$ 428	$ 294	$ 70