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Nature of Operations and Significant Accounting Policies (Other Items - Share Repurchases) (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012 | Apr. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Share repurchase program |  |  |  | $ 1,000,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Shares acquired, repurchase amount | $ 517,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 353,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 734,000,000 us-gaap_PaymentsForRepurchaseOfCommonStock |
Stock repurchased, shares | 17 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 14 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 34 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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