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Other Comprehensive Income / (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 25, 2016 | Mar. 27, 2015
Equity [Abstract] |  |
Total comprehensive earnings, net of tax | $ 363 | $ 440
Pension and Other Post-Employment Benefits |  |
Other Comprehensive Income (Loss) |  |
Beginning balance | (601) |
Loss Before Reclassifications | 0 |
Amounts Reclassified to Net Earnings | 13 |
Tax Expense | (5) |
Total Other Comprehensive Income (Loss) | 8 |
Ending balance | (593) |
Other |  |
Other Comprehensive Income (Loss) |  |
Beginning balance | (64) |
Loss Before Reclassifications | (1) |
Amounts Reclassified to Net Earnings | 0 |
Tax Expense | 0 |
Total Other Comprehensive Income (Loss) | (1) |
Ending balance | (65) |
Accumulated Other Comprehensive Income (Loss) |  |
Other Comprehensive Income (Loss) |  |
Beginning balance | (665) |
Loss Before Reclassifications | (1) |
Amounts Reclassified to Net Earnings | 13 |
Tax Expense | (5) |
Total Other Comprehensive Income (Loss) | 7 |
Ending balance | $ (658) |

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