Calculation of Net Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Earnings Per Share [Line Items]
Net income (loss)	$ 210	$ (58)	$ 256	$ (13)
Weighted-average shares outstanding	550	547	550	546
Basic earnings (loss) per share	$ 0.38	$ (0.11)	$ 0.47	$ (0.02)
Net income (loss)	$ 210	$ (58)	$ 256	$ (13)
Weighted-average shares outstanding	550	547	550	546
Stock options and restricted stock	10		7
Diluted weighted-average shares outstanding	560	547	557	546
Diluted earnings (loss) per share	$ 0.38	$ (0.11)	$ 0.46	$ (0.02)

Earnings Per Share [Line Items]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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