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Pending Acquisition of Orbital ATK	12 Months Ended
Pending Acquisition of Orbital ATK	Dec. 31, 2017
Business Combination [Abstract]
Business Combination Disclosure [Text Block]	2. PENDING ACQUISITION OF ORBITAL ATK On September 17, 2017, the company entered into a definitive merger agreement to acquire all of the outstanding shares of Orbital ATK, Inc. (Orbital ATK) for approximately $7.8 billion in cash, plus the assumption of approximately $1.4 billion in net debt (the “Orbital ATK Acquisition”). Under the terms of the merger agreement, Orbital ATK shareholders are to receive all-cash consideration of $134.50 per share. We expect to fund the Orbital ATK Acquisition with the proceeds from our debt financing completed in October 2017 and cash on hand. See Note 10 for further information on our Orbital ATK Acquisition financing. On November 29, 2017, Orbital ATK shareholders approved the proposed Orbital ATK Acquisition. We currently expect the transaction to close in the first half of 2018, after receiving regulatory approvals. Upon completion of the Orbital ATK Acquisition, we plan to establish Orbital ATK as a new, fourth business sector named Northrop Grumman Innovation Systems.