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Fair Value Measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Dec. 29, 2019
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Debt Securities, Available-for-sale [Abstract] |  |
Available-for-sale Securities - Estimated Fair Value | $ 10,047 | $ 4,368
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 11,174 | 17,305
Marketable securities | 7,961 | $ 1,982
Total cash, cash equivalents and current marketable securities, Carrying Amount | 19,134 |
Total cash, cash equivalents and current marketable securities, Unrecognized Gain | 1 |
Total cash, cash equivalents and current marketable securities, Unrecognized Loss | 0 |
Total cash, cash equivalents and current marketable securities, Estimated Fair Value | 19,135 |
Held-to-maturity Securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 9,088 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 9,088 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 7,680 |
Marketable securities | 1,408 |
Held-to-maturity Securities | Cash |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 2,215 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 2,215 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 2,215 |
Held-to-maturity Securities | Non-U.S. sovereign securities(1) |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 655 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 655 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 225 |
Marketable securities | 430 |
Held-to-maturity Securities | U.S. reverse repurchase agreements |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 2,372 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 2,372 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 2,372 |
Marketable securities | 0 |
Held-to-maturity Securities | Other reverse repurchase agreements |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 460 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 460 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 460 |
Held-to-maturity Securities | Corporate debt securities(1) |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 1,279 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 1,279 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 301 |
Marketable securities | 978 |
Held-to-maturity Securities | Money market funds |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 1,528 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 1,528 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 1,528 |
Held-to-maturity Securities | Time deposits(1) |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Held-to-maturity Securities - Carrying Amount | 579 |
Held-to-maturity Securities, Unrecognized Gain | 0 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held-to-maturity Securities - Estimated Fair Value | 579 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 579 |
Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Available-for-sale Securities - Carrying Amount | 10,046 |
Available-for-sale Securities, Unrecognized Gain | 1 |
Available-for-sale Securities, Unrecognized Loss | 0 |
Available-for-sale Securities - Estimated Fair Value | 10,047 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 3,494 |
Marketable securities | 6,553 |
Available-for-sale Securities | Corporate debt securities(1) |  |
Debt Securities, Available-for-sale [Abstract] |  |
Available-for-sale Securities - Carrying Amount | 255 |
Available-for-sale Securities, Unrecognized Gain | 1 |
Available-for-sale Securities, Unrecognized Loss | 0 |
Available-for-sale Securities - Estimated Fair Value | 256 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 14 |
Marketable securities | 242 |
Available-for-sale Securities | US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Available-for-sale Securities - Carrying Amount | 9,786 |
Available-for-sale Securities, Unrecognized Gain | 0 |
Available-for-sale Securities, Unrecognized Loss | 0 |
Available-for-sale Securities - Estimated Fair Value | 9,786 |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |
Cash and Cash Equivalents | 3,480 |
Marketable securities | $ 6,306 |

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