Nonpension Postretirement and Postemployment Benefits (Level 3 Gains and Losses) (Details) (Nonpension Postretirement [Member], USD $) In Millions, unless otherwise specified								12 Months Ended
Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Dec. 31, 2011 Level 3 [Member]	Jan. 01, 2011 Level 3 [Member]	Dec. 31, 2011 Bonds, Other [Member]	Jan. 01, 2011 Bonds, Other [Member]	Dec. 31, 2011 Bonds, Other [Member] Level 3 [Member]	Jan. 01, 2011 Bonds, Other [Member] Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value beginning of year	$ 965	$ 1,008	$ 672	$ 0	$ 0	$ 12	$ 7	$ 0	$ 1
Purchases								0	0
Sales								0	(1)
Fair value end of year	$ 965	$ 1,008	$ 672	$ 0	$ 0	$ 12	$ 7	$ 0	$ 0

The amount of increase in the plan assets attributed to a business combination.

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The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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