Pension and Retiree Medical Benefits Impact of Application of Full Yield Curve Approach (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 11, 2016	Jun. 11, 2016
Defined Benefit Plan Disclosure [Line Items]
Change in Accounting Estimate	$ 29	$ 57
Change in Accounting Estimate after Tax	$ 19	$ 37
Change in Accounting Estimate per Share	$ 0.01	$ 0.03

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)

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