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Fair Value Measurements - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 30, 2018 | Jul. 01, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Abstract] |  |  |  |
Available-for-sale Securities - Estimated Fair Value | $ 2,767 | $ 9,734 |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 14,376 | 18,107 | $ 17,569 | $ 17,824
Marketable securities | 902 | $ 1,580 |  |
Held-to-maturity Securities |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 12,511 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 12,511 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 12,511 |  |  |
Marketable securities | 0 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Cash |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 2,615 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 2,615 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 2,615 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Other sovereign securities(1) |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 380 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 380 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 380 |  |  |
Marketable securities |  |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | U.S. reverse repurchase agreements |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 7,014 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 7,014 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 7,014 |  |  |
Marketable securities |  |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Other reverse repurchase agreements |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 219 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 219 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 219 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Corporate debt securities(1) |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 264 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 264 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 264 |  |  |
Marketable securities |  |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Money market funds |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 1,368 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 1,368 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 1,368 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Held-to-maturity Securities | Time deposits(1) |  |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |  |
Held-to-maturity Securities - Carrying Amount | 651 |  |  |
Held-to-maturity Securities - Estimated Fair Value | 651 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 651 |  |  |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  |
Available-for-sale Securities |  |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 2,766 |  |  |
Available-for-sale Securities - Estimated Fair Value | 2,767 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 1,865 |  |  |
Marketable securities | 902 |  |  |
Available-for-sale Securities | Other sovereign securities(1) |  |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 0 |  |  |
Available-for-sale Securities - Estimated Fair Value | 0 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 0 |  |  |
Marketable securities | 0 |  |  |
Available-for-sale Securities | Corporate debt securities(1) |  |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 265 |  |  |
Available-for-sale Securities - Estimated Fair Value | 265 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 20 |  |  |
Marketable securities | 245 |  |  |
Available-for-sale Securities | US Treasury and Government [Member] |  |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |  |
Available-for-sale Securities - Carrying Amount | 2,501 |  |  |
Available-for-sale Securities - Estimated Fair Value | 2,502 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 |  |  |
Debt Securities, Available-for-sale and Held-to-maturity [Abstract] |  |  |  |
Cash and Cash Equivalents | 1,845 |  |  |
Marketable securities | $ 657 |  |  |

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