Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 23, 2013		Mar. 24, 2012
Schedule of changes in accumulated other comprehensive income [Abstract]
Beginning Balance Accumulated Other Comprehensive Income (Loss), Translation Adjustments and Gains (Losses) From Intra-Entity Transactions of Long-Term Nature	$ 166
Amounts classified into other comprehensive income, net of tax - translation adjustments and gains (losses) from intra-entity transactions	2
Amounts reclassified from accumulated other comprehensive income, net of tax - translation adjustments and gains (losses) from intra-entity transactions	0
OCI, Translation Adjustments and Gains (Losses) From Intra-Entity Transactions of a Long-Term Nature	2
Ending Balance Accumulated Other Comprehensive Income (Loss), Translation Adjustments and Gains (Losses) From Intra-Entity Transactions of Long-Term Nature	168
Beginning Balance Accumulated Other Comprehensive Income (Loss), Pension and Postretirement Benefit Plans	(286)
Amounts classified into other comprehensive income, net of tax - pension and post-retirment benefit plans	(7)
Amounts reclassifed from accumulated other comprehensive income, net of tax - pension and post-retirement benefit plans	16	[1]
OCI, Pension and Postretirement Benefit Plans	9
Ending Balance Accumulated Other Comprehensive Income (Loss), Pension and Postretirement Benefit Plans	(277)
Beginning Balance Accumulated Other Comprehensive Income (Loss), Net Unrealized Loss on Derivative Instruments	(12)
Amounts classified into other comprehensive income, net of tax - derivative instruments	1
Amounts reclassified from accumulated other comprehensive income, net of tax - derivative instruments	0
OCI, Net Unrealized Loss on Derivative Instruments	1
Ending Balance Accumulated Other Comprehensive Income (Loss), Net Unrealized Loss on Derivative Instruments	(11)
Beginning Accumulated Other Comprehensive Income (Loss), Net of Tax	(132)
Amounts classified into other comprehensive income, net of tax	(4)
Amounts reclassified from accumulated other comprehensive income, net of tax	16
Net current-period other comprehensive income	12		22
Ending Accumulated Other Comprehensive Income (Loss), Net of Tax	(120)
Amortization of net loss	15
Additional loss (gain) recognized due to Settlement	10	[2]
Tax (expense) benefit	$ (9)		$ (6)

[1] Amounts reclassified from accumulated OCI for pension and post-retirement benefit plan losses include amortization of net losses of $15 million, settlement charges of $10 million and the related income tax benefit of $9 million. See Note 10 Pension Benefits for further information.

[2] Loss is a result of settlement transactions from a non-funded plan which exceeded the sum of annual service and interest costs for that plan.