Income Taxes (Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Earnings From Continuing Operations [Abstract]
Earnings Before Income Taxes	$ 3,044	$ 2,922	$ 2,971
Current:
Federal	729us-gaap_CurrentFederalTaxExpenseBenefit	671us-gaap_CurrentFederalTaxExpenseBenefit	450us-gaap_CurrentFederalTaxExpenseBenefit
State	90	87	66
Subtotal Current	819us-gaap_CurrentIncomeTaxExpenseBenefit	758us-gaap_CurrentIncomeTaxExpenseBenefit	516us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	291	285	530
State	7	15	62
Subtotal Deferred	298us-gaap_DeferredIncomeTaxExpenseBenefit	300us-gaap_DeferredIncomeTaxExpenseBenefit	592us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit)	$ 1,117us-gaap_IncomeTaxExpenseBenefit	$ 1,058us-gaap_IncomeTaxExpenseBenefit	$ 1,108us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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