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Investments, Available-for-Sale Investments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2016
Available-for-sale Securities [Abstract] |  |  |  |  |
Fair Value | $ 11,305 |  | $ 11,305 |  |
Adjusted Cost, Total | 13,399 |  | 13,399 |  | $ 14,344
Gross Unrealized Gains, Total | 3,979 |  | 3,979 |  | 3,372
Gross Unrealized Losses, Total | (14) |  | (14) |  | (34)
Fair Value, Total | 17,364 |  | 17,364 |  | 17,682
Available-for-sale Securities, sale Proceeds | 2,900 | $ 195 | 4,700 | $ 4,000 |
Available-for-sale Securities, Gross Realized Gains | 927 | 41 | 2,000 | 538 |
Due in 1 year or less, Fair Value | 3,314 |  | 3,314 |  |
Due in 1-2 years, Fair Value | 1,573 |  | 1,573 |  |
Due in 2-5 years, Fair Value | 2,200 |  | 2,200 |  |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value | 71 |  | 71 |  |
Instruments not due at a single maturity date, Fair Value | 4,147 |  | 4,147 |  |
Other than Temporary Impairment Losses, Investments | 10 | $ 48 | 613 | $ 137 |
Corporate Debt Securities [Member] |  |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |  |
Adjusted Cost | 2,603 |  | 2,603 |  | 3,847
Gross Unrealized Gains | 12 |  | 12 |  | 4
Gross Unrealized Losses | (7) |  | (7) |  | (14)
Fair Value | 2,608 |  | 2,608 |  | 3,837
Fixed Income Securities [Member] |  |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |  |
Adjusted Cost | 7,709 |  | 7,709 |  | 6,098
Gross Unrealized Gains | 6 |  | 6 |  | 5
Gross Unrealized Losses | (4) |  | (4) |  | (11)
Fair Value | 7,711 |  | 7,711 |  | 6,092
Government Debt [Member] |  |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |  |
Adjusted Cost | 986 |  | 986 |  | 1,581
Gross Unrealized Gains | 3 |  | 3 |  | 0
Gross Unrealized Losses | (3) |  | (3) |  | (8)
Fair Value | 986 |  | 986 |  | 1,573
Marketable Equity Securities [Member] |  |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |  |
Adjusted Cost | 2,101 |  | 2,101 |  | 2,818
Gross Unrealized Gains | 3,958 |  | 3,958 |  | 3,363
Gross Unrealized Losses | 0 |  | 0 |  | (1)
Fair Value | $ 6,059 |  | 6,059 |  | $ 6,180
Cloudera, Inc [Member] |  |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |  |
Other than Temporary Impairment Losses, Investments |  |  | $ 278 |  |

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