Rocky Flats Settlement	12 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Legal Matters and Contingencies	Rocky Flats Settlement From 1975 to 1989, Rockwell International Corporation (RIC) operated the Rocky Flats facility in Colorado for the U.S. Department of Energy (DoE). In 1990, a class of landowners near Rocky Flats sued RIC and Dow Chemical, another former operator of the facility. In May 2016, the parties agreed to settle this case and the DoE authorized the settlement. Under the settlement agreement, which is subject to court approval, we and Dow Chemical will pay $375.0 million in the aggregate to resolve the claims. Under RIC’s contract with the DoE and federal law, RIC is entitled to indemnification by the DoE for the settlement amount. When RIC was acquired by Boeing in 1996, we agreed to indemnify Boeing for RIC’s liabilities related to Rocky Flats and received the benefits of RIC’s corresponding indemnity rights against the DoE. We expect to be fully reimbursed by the DoE for our obligation of $243.75 million under the settlement, either before or after we pay the amounts due. We expect to pay up to $242.5 million within the next 12 months. We will promptly pursue reimbursement from the DoE; however, it is uncertain whether the government indemnification and reimbursement process will be completed by the time payment is due. At September 30, 2016, the liability is included within other current liabilities in the Consolidated Balance Sheet. An indemnification receivable of $243.75 million at September 30, 2016 is also included within other assets in the Consolidated Balance Sheet.

Rocky Flats Settlement

From 1975 to 1989, Rockwell International Corporation (RIC) operated the Rocky Flats facility in Colorado for the U.S. Department of Energy (DoE). In 1990, a class of landowners near Rocky Flats sued RIC and Dow Chemical, another former operator of the facility. In May 2016, the parties agreed to settle this case and the DoE authorized the settlement. Under the settlement agreement, which is subject to court approval, we and Dow Chemical will pay $375.0 million in the aggregate to resolve the claims. Under RIC’s contract with the DoE and federal law, RIC is entitled to indemnification by the DoE for the settlement amount. When RIC was acquired by Boeing in 1996, we agreed to indemnify Boeing for RIC’s liabilities related to Rocky Flats and received the benefits of RIC’s corresponding indemnity rights against the DoE. We expect to be fully reimbursed by the DoE for our obligation of $243.75 million under the settlement, either before or after we pay the amounts due. We expect to pay up to $242.5 million within the next 12 months. We will promptly pursue reimbursement from the DoE; however, it is uncertain whether the government indemnification and reimbursement process will be completed by the time payment is due. At September 30, 2016, the liability is included within other current liabilities in the Consolidated Balance Sheet. An indemnification receivable of $243.75 million at September 30, 2016 is also included within other assets in the Consolidated Balance Sheet.