Pension and Retiree Medical Benefits Impact of Application of Full Yield Curve Approach $ / shares in Units, $ in Millions	3 Months Ended
Mar. 19, 2016 USD ($) $ / shares
Defined Benefit Plan Disclosure [Line Items]
Change in Accounting Estimate	$ 28
Change in Accounting Estimate after Tax	$ 18
Change in Accounting Estimate per Share \| $ / shares	$ 0.01

Impact of changing the method used to calculate the service and interest cost components of net periodic benefit cost from a single weighted-average discount rate to the full yield curve approach, applying specific spot rates along the yield curve (after tax)

No definition available.

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