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Fair Value Measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jul. 01, 2018 | Dec. 31, 2017 | Jul. 02, 2017 | Jan. 01, 2017
--- | --- | --- | --- | ---
Available-for-sale Securities [Abstract] |  |  |  |
Available-for-sale Securities - Estimated Fair Value | $ 9,031 | $ 5,310 |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 17,569 | 17,824 | $ 12,598 | $ 18,972
Marketable securities | 570 | $ 472 |  |
Held-to-maturity Securities |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 9,108 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 9,108 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 9,108 |  |  |
Marketable securities | 0 |  |  |
Held-to-maturity Securities | Cash |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 2,473 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 2,473 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 2,473 |  |  |
Held-to-maturity Securities | Other sovereign securities(1) |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 180 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 180 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 180 |  |  |
Marketable securities |  |  |  |
Held-to-maturity Securities | U.S. reverse repurchase agreements |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 2,425 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 2,425 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 2,425 |  |  |
Marketable securities |  |  |  |
Held-to-maturity Securities | Other reverse repurchase agreements |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 425 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 425 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 425 |  |  |
Held-to-maturity Securities | Corporate debt securities(1) |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 0 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 0 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 0 |  |  |
Marketable securities | 0 |  |  |
Held-to-maturity Securities | Money market funds |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 2,507 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 2,507 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 2,507 |  |  |
Held-to-maturity Securities | Time deposits(1) |  |  |  |
Held-to-maturity Securities [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 1,098 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 1,098 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 1,098 |  |  |
Available-for-sale Securities |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 9,031 |  |  |
Available-for-sale Securities - Estimated Fair Value | 9,031 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 8,461 |  |  |
Marketable securities | 570 |  |  |
Available-for-sale Securities | Other sovereign securities(1) |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 0 |  |  |
Available-for-sale Securities - Estimated Fair Value | 0 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 0 |  |  |
Marketable securities | 0 |  |  |
Available-for-sale Securities | Corporate debt securities(1) |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 265 |  |  |
Available-for-sale Securities - Estimated Fair Value | 265 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 24 |  |  |
Marketable securities | 241 |  |  |
Available-for-sale Securities | US Treasury and Government [Member] |  |  |  |
Available-for-sale Securities [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 8,766 |  |  |
Available-for-sale Securities - Estimated Fair Value | 8,766 |  |  |
Available-for-sale Securities and Held-to-maturity Securities [Abstract] |  |  |  |
Cash and Cash Equivalents | 8,437 |  |  |
Marketable securities | $ 329 |  |  |

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