Business Acquisition (Unaudited) (Details 3) - USD ($) $ in Millions		6 Months Ended
	Jun. 06, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Business Combination, Below Market Contracts, reduction in sales for 2018	$ 52
Business Combination, Below Market Contracts, reduction in sales for 2019	70
Business Combination, Below Market Contracts, reduction in sales for 2020	32
Business Combination, Below Market Contracts, reduction in sales for 2021	1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		12 years
Orbital ATK [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	1,305
Customer Contracts [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 1,040
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 265
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years