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Other Comprehensive Income / (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2015 | Jun. 27, 2014 | Jun. 26, 2015 | Jun. 27, 2014
Equity [Abstract] |  |  |  |
Total comprehensive earnings, net of tax | $ 565 | $ 544 | $ 1,005 | $ 958
Pension and Other Post-Employment Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance, Net of Tax |  |  | (611) |
Other Comprehensive Income (Loss) |  |  |  |
Loss Before Reclassifications |  |  | 0 |
Amounts Reclassified to Net Earnings |  |  | 36 |
Tax Expense |  |  | (15) |
Total Other Comprehensive Income (Loss) |  |  | 21 |
Ending Balance, Net of Tax | (590) |  | (590) |
Other |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance, Net of Tax |  |  | (55) |
Other Comprehensive Income (Loss) |  |  |  |
Loss Before Reclassifications |  |  | (11) |
Amounts Reclassified to Net Earnings |  |  | 0 |
Tax Expense |  |  | 0 |
Total Other Comprehensive Income (Loss) |  |  | (11) |
Ending Balance, Net of Tax | (66) |  | (66) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance, Net of Tax |  |  | (666) |
Other Comprehensive Income (Loss) |  |  |  |
Loss Before Reclassifications |  |  | (11) |
Amounts Reclassified to Net Earnings |  |  | 36 |
Tax Expense |  |  | (15) |
Total Other Comprehensive Income (Loss) |  |  | 10 |
Ending Balance, Net of Tax | $ (656) |  | $ (656) |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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