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Nature of Operations and Significant Accounting Policies - Share Repurchases (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 25, 2015 | Sep. 26, 2014 | Sep. 25, 2015 | Sep. 26, 2014 | Apr. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Share repurchase program |  |  |  |  | $ 2,000,000,000
Shares repurchased | $ 262,000,000 | $ 131,000,000 | $ 546,000,000 | $ 388,000,000 |
Shares repurchased during the period (in shares) | 9 | 4 | 17 | 13 |

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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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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