Business Acquisition (Unaudited) (Details 2) - USD ($) $ / shares in Units, $ in Millions	Jun. 06, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 18,747	$ 12,455
Shares of Orbital ATK common stock outstanding as of the Merger date	57,562,152
Cash consideration per share of Orbital ATK common stock	$ 134.50
Total purchase price	$ 7,742
Orbital ATK [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	85
Accounts receivable, net	616
Unbilled receivables, net	1,237
Inventoried costs, net	220
Other current assets	193
Property, plant, and equipment	1,500
Goodwill	6,295
Intangible assets	1,305
Deferred tax assets	(230)
Other non-current assets	131
Total assets acquired	11,352
Trade accounts payable	(397)
Accrued employee compensation	(158)
Advance payments and amounts in excess of costs incurred	(222)
Below market contracts	(155)
Other current liabilities	(298)
Long-term debt	(1,687)
Pension and other post-retirement benefit plan liabilities	(557)
Other non-current liabilities	(136)
Total liabilities assumed	(3,610)
Total purchase price	$ 7,742