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Retirement Plans (Details 10) (Unobservable Inputs (Level 3), USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012 Hedge funds	Dec. 29, 2012 Private equity partnerships	Dec. 29, 2012 Real estate
Reconciliation for fair value measurements that use significant unobservable inputs (Level 3)
Balance at beginning of year	$ 920	$ 818	$ 97	$ 314	$ 407
Actual return on plan assets:
Related to assets still held at reporting date			7	(7)	26
Related to assets sold during the period				34	3
Purchases, sales and settlements, net				(33)	72
Balance at end of year	$ 920	$ 818	$ 104	$ 308	$ 508

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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