Segment Information (Unaudited) (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Sales	$ 8,189	$ 6,735
Concentration Risk, Percentage	100.00%	100.00%
US Government [Member]
Revenue, Major Customer [Line Items]
Sales	$ 6,757	$ 5,700
Concentration Risk, Percentage	83.00%	85.00%
US Government [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,022	$ 2,908
Concentration Risk, Percentage	86.00%	89.00%
US Government [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,015	$ 0
Concentration Risk, Percentage	71.00%	0.00%
US Government [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,167	$ 2,190
Concentration Risk, Percentage	75.00%	76.00%
US Government [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 553	$ 602
Concentration Risk, Percentage	57.00%	53.00%
International Customer [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,217	$ 870
Concentration Risk, Percentage	15.00%	13.00%
International Customer [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 394	$ 271
Concentration Risk, Percentage	11.00%	8.00%
International Customer [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 247	$ 0
Concentration Risk, Percentage	17.00%	0.00%
International Customer [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 367	$ 379
Concentration Risk, Percentage	13.00%	13.00%
International Customer [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 209	$ 220
Concentration Risk, Percentage	21.00%	19.00%
Other Customers [Member]
Revenue, Major Customer [Line Items]
Sales	$ 215	$ 165
Concentration Risk, Percentage	2.00%	2.00%
Other Customers [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 34	$ 42
Concentration Risk, Percentage	1.00%	1.00%
Other Customers [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 114	$ 0
Concentration Risk, Percentage	8.00%	0.00%
Other Customers [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 34	$ 30
Concentration Risk, Percentage	1.00%	1.00%
Other Customers [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 33	$ 93
Concentration Risk, Percentage	3.00%	8.00%
Intersegment Eliminations [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 46	$ 59
Concentration Risk, Percentage	2.00%	2.00%
Intersegment Eliminations [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 62	$ 0
Concentration Risk, Percentage	4.00%	0.00%
Intersegment Eliminations [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 318	$ 284
Concentration Risk, Percentage	11.00%	10.00%
Intersegment Eliminations [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 182	$ 229
Concentration Risk, Percentage	19.00%	20.00%
Operating Segments [Member] | Aerospace Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 3,496	$ 3,280
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] | Innovation Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 1,438	$ 0
Concentration Risk, Percentage	100.00%	0.00%
Operating Segments [Member] | Mission Systems [Member]
Revenue, Major Customer [Line Items]
Sales	$ 2,886	$ 2,883
Concentration Risk, Percentage	100.00%	100.00%
Operating Segments [Member] | Technology Services [Member]
Revenue, Major Customer [Line Items]
Sales	$ 977	$ 1,144
Concentration Risk, Percentage	100.00%	100.00%