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Other Changes In Plan Assets and Benefit Obligations Recognized In Other Comprehensive Loss (Income) (Detail) - North America - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (income) at beginning of year | $ 76 | $ 67 | $ (26)
Net loss (gain) | (38) | 9 | 93
Accumulated other comprehensive loss (income) at end of year | 38 | 76 | 67
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (income) at beginning of year | (1) | 1 |
Net loss (gain) |  | (2) | 1
Accumulated other comprehensive loss (income) at end of year | $ (1) | $ (1) | $ 1

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