Income Taxes (Income Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013
Reconciliation between the statutory income tax rate and the effective income tax rate [Abstract]
Federal Income Taxes	$ 1,098	$ 1,066	$ 1,023
State Income Taxes Expense (Benefit)	86	61	65
Other	(14)	(10)	(30)
Income Tax Expense (Benefit)	$ 1,170	$ 1,117	$ 1,058
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal Income Taxes	35.00%	35.00%	35.00%
State Income Taxes	2.70%	2.00%	2.20%
Other	(0.40%)	(0.30%)	(1.00%)
Income Tax Rate	37.30%	36.70%	36.20%
Federal and State Legislative [Member]
Reconciliation between the statutory income tax rate and the effective income tax rate [Abstract]
State Income Taxes Expense (Benefit)	$ (4)	$ (31)	$ (42)

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification
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-Paragraph 9
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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