OTHER	3 Months Ended
Mar. 25, 2018
Accounting Policies [Abstract]
OTHER	OTHER Equity Method Investee Impairment During the quarter ended March 26, 2017, equity earnings included a charge recorded of approximately $64 million ($40 million, or $0.14 per share, after tax), which represented our portion of a non-cash asset impairment related to certain long-lived assets held by our equity method investee, AMMROC. We are continuing to monitor this investment. If AMMROC’s business experiences additional performance, business base and economic issues, we may have to record our portion of additional charges, which could adversely affect our business, financial condition and results of operations. Income Taxes Our effective income tax rates were 14.9% and 23.8% for the quarters ended March 25, 2018 and March 26, 2017. The rate for the quarter ended March 25, 2018 includes the provisional impact of the Tax Act enacted in December 2017. The rates for both periods benefited from tax deductions for dividends paid to our defined contribution plans with an employee stock ownership plan feature, tax deductions for employee equity awards, and the research and development tax credit. The rate for the first quarter of 2018 also benefited from the Tax Act’s deduction for foreign derived intangible income. The rate for the first quarter of 2017 benefited from tax deductions for U.S. manufacturing activities, which the Tax Act repealed for years after 2017. While we have substantially completed our provisional analysis of the income tax effects of the Tax Act as of December 31, 2017 and recorded a reasonable estimate in 2017 of such effects, actual effects may differ, possibly materially, due to, among other things, further refinement of our calculations, changes in interpretations and assumptions that we have made, additional guidance that may be issued by the U.S. Government, and actions and related accounting policy decisions we may take as a result of the Tax Act. We will complete our analysis of the impact of the Tax Act for 2017 over a one-year measurement period ending December 22, 2018, and any adjustments during this measurement period will be included in net earnings from continuing operations as an adjustment to income tax expense in the reporting period when such adjustments are determined. We have not identified any change to the net one-time charge for the period ending December 31, 2017 related to the Tax Act.

OTHER

Equity Method Investee Impairment

During the quarter ended March 26, 2017, equity earnings included a charge recorded of approximately $64 million ($40 million, or $0.14 per share, after tax), which represented our portion of a non-cash asset impairment related to certain long-lived assets held by our equity method investee, AMMROC. We are continuing to monitor this investment. If AMMROC’s business experiences additional performance, business base and economic issues, we may have to record our portion of additional charges, which could adversely affect our business, financial condition and results of operations.

Income Taxes

Our effective income tax rates were 14.9% and 23.8% for the quarters ended March 25, 2018 and March 26, 2017. The rate for the quarter ended March 25, 2018 includes the provisional impact of the Tax Act enacted in December 2017. The rates for both periods benefited from tax deductions for dividends paid to our defined contribution plans with an employee stock ownership plan feature, tax deductions for employee equity awards, and the research and development tax credit. The rate for the first quarter of 2018 also benefited from the Tax Act’s deduction for foreign derived intangible income. The rate for the first quarter of 2017 benefited from tax deductions for U.S. manufacturing activities, which the Tax Act repealed for years after 2017.

While we have substantially completed our provisional analysis of the income tax effects of the Tax Act as of December 31, 2017 and recorded a reasonable estimate in 2017 of such effects, actual effects may differ, possibly materially, due to, among other things, further refinement of our calculations, changes in interpretations and assumptions that we have made, additional guidance that may be issued by the U.S. Government, and actions and related accounting policy decisions we may take as a result of the Tax Act. We will complete our analysis of the impact of the Tax Act for 2017 over a one-year measurement period ending December 22, 2018, and any adjustments during this measurement period will be included in net earnings from continuing operations as an adjustment to income tax expense in the reporting period when such adjustments are determined. We have not identified any change to the net one-time charge for the period ending December 31, 2017 related to the Tax Act.