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Investments, Available For Sale Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Available-for-sale Securities [Abstract] |  |  |
Fair Value | $ 11,502 |  |
Adjusted Cost, Total | 14,344 | $ 19,311 |
Gross Unrealized Gains, Total | 3,372 | 2,710 |
Gross Unrealized Losses, Total | (34) | (14) |
Fair Value, Total | 17,682 | 22,007 |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | 4,100 | 2,200 | $ 1,700
Available-for-sale Securities, Gross Realized Gains | 538 | 133 | $ 136
Due in 1 year or less, Fair Value | 4,866 |  |
Due in 1-2 years, Fair Value | 1,956 |  |
Due in 2-5 years, Fair Value | 2,760 |  |
Instruments not due at a single maturity date, Fair Value | 1,920 |  |
Corporate debt |  |  |
Available-for-sale Securities [Abstract] |  |  |
Adjusted Cost | 3,847 | 4,169 |
Gross Unrealized Gains | 4 | 3 |
Gross Unrealized Losses | (14) | (11) |
Fair Value | 3,837 | 4,161 |
Financial institution instruments |  |  |
Available-for-sale Securities [Abstract] |  |  |
Adjusted Cost | 6,098 | 11,140 |
Gross Unrealized Gains | 5 | 1 |
Gross Unrealized Losses | (11) | (2) |
Fair Value | 6,092 | 11,139 |
Government debt |  |  |
Available-for-sale Securities [Abstract] |  |  |
Adjusted Cost | 1,581 | 748 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (8) | (1) |
Fair Value | 1,573 | 747 |
Marketable equity securities |  |  |
Available-for-sale Securities [Abstract] |  |  |
Adjusted Cost | 2,818 | 3,254 |
Gross Unrealized Gains | 3,363 | 2,706 |
Gross Unrealized Losses | (1) | 0 |
Fair Value | $ 6,180 | $ 5,960 |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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