Pending Acquisition of Orbital ATK (Unaudited) Pending Acquisition of Orbital ATK (Unaudited)

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

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$134.50per share. We expect to fund the Orbital ATK Acquisition with the proceeds from our debt financing completed in October 2017 and cash on hand.On November 29, 2017, Orbital ATK shareholders approved the proposed Orbital ATK Acquisition. On February 12, 2018, the European Commission 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.