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Retirement Plans (Details 9) (Unobservable Inputs (Level 3) [Member], USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011 Hedge Funds [Member]	Dec. 31, 2011 Private Equity Partnerships [Member]	Dec. 31, 2011 Real Estate [Member]
Reconciliation for fair value measurements that use significant unobservable inputs (Level 3)
Balance at beginning of year	$ 818	$ 762	$ 101	$ 324	$ 337
Actual return on plan assets:
Related to assets still held at reporting date			(4)	7	32
Related to assets sold during the period			0	31	2
Purchases, sales and settlements, net			0	(48)	36
Balance at end of year	$ 818	$ 762	$ 97	$ 314	$ 407

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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