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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015
Income Tax Contingency [Line Items] |  |
Total gross amount of reserves for income taxes | $ 1,885 |
Interest accrued | 193 | $ 144
Interest accrued recognized | 61 | $ 14
Operating loss carryforwards | 11,300 |
Income tax undistributed international earnings | 44,900 |
Expire in 2016 |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | 100 |
Expire Between 2017 and 2035 Years |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | 9,900 |
Carried Forward Indefinitely |  |
Income Tax Contingency [Line Items] |  |
Operating loss carryforwards | $ 1,300 |

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