Net Loss Per Share (Details) (Components of Basic and Diluted Loss Per Share) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Mar. 26, 2016	Mar. 28, 2015
Numerator – Net loss:
Net loss	$ (109)	$ (180)
Denominator – Weighted average shares
Weighted-average shares outstanding, basic and diluted	793	777
Net loss per share:
Basic	$ (0.14)	$ (0.23)
Diluted	$ (0.14)	$ (0.23)
Stock Options, Restricted Stock and Restricted Stock Units
Earnings per Share
Anti-dilutive shares	50	64

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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