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Cash, cash equivalents and current marketable securities - Cash and Cash Equivalent Composition (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Jan. 01, 2023
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Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Fair value, available-for-sale | $ 8,874 | $ 10,487
Cash & Cash Equivalents | 21,859 | 12,889
Current Marketable Securities | 1,068 | 9,392
Held-to-maturity Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 14,053 | 11,794
Held-to-maturity, unrecognized loss | 0 | (1)
Fair value, held-to-maturity | 14,053 | 11,793
Cash & Cash Equivalents | 13,556 | 10,921
Current Marketable Securities | 497 | 873
Held-to-maturity Securities | Non-U.S. Sovereign Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 522 |
Held-to-maturity, unrecognized loss | 0 |
Fair value, held-to-maturity | 522 |
Cash & Cash Equivalents | 174 |
Current Marketable Securities | 348 |
Held-to-maturity Securities | Cash |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 3,340 | 3,691
Held-to-maturity, unrecognized loss | 0 | 0
Fair value, held-to-maturity | 3,340 | 3,691
Cash & Cash Equivalents | 3,340 | 3,691
Current Marketable Securities | 0 | 0
Held-to-maturity Securities | U.S. Reverse repurchase agreements |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 4,377 | 1,419
Held-to-maturity, unrecognized loss | 0 | 0
Fair value, held-to-maturity | 4,377 | 1,419
Cash & Cash Equivalents | 4,377 | 1,419
Current Marketable Securities | 0 | 0
Held-to-maturity Securities | Corporate debt securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 338 | 873
Held-to-maturity, unrecognized loss | 0 | (1)
Fair value, held-to-maturity | 338 | 872
Cash & Cash Equivalents | 189 | 0
Current Marketable Securities | 149 | 873
Held-to-maturity Securities | Money market funds |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 4,814 | 5,368
Held-to-maturity, unrecognized loss | 0 | 0
Fair value, held-to-maturity | 4,814 | 5,368
Cash & Cash Equivalents | 4,814 | 5,368
Current Marketable Securities | 0 | 0
Held-to-maturity Securities | Time deposits |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 662 | 443
Held-to-maturity, unrecognized loss | 0 | 0
Fair value, held-to-maturity | 662 | 443
Cash & Cash Equivalents | 662 | 443
Current Marketable Securities | 0 | 0
Available-for-sale Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 8,875 | 10,521
Available-for-sale, unrecognized loss | (1) | (34)
Fair value, available-for-sale | 8,874 | 10,487
Cash & Cash Equivalents | 8,303 | 1,968
Current Marketable Securities | 571 | 8,519
Available-for-sale Securities | Corporate debt securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 237 | 352
Available-for-sale, unrecognized loss | 0 | (1)
Fair value, available-for-sale | 237 | 351
Cash & Cash Equivalents | 43 | 46
Current Marketable Securities | 194 | 305
Available-for-sale Securities | U.S. Gov't Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 8,562 | 9,959
Available-for-sale, unrecognized loss | 0 | (28)
Fair value, available-for-sale | 8,562 | 9,931
Cash & Cash Equivalents | 8,259 | 1,922
Current Marketable Securities | 303 | 8,009
Available-for-sale Securities | U.S. Gov't Agencies |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 71 | 210
Available-for-sale, unrecognized loss | (1) | (5)
Fair value, available-for-sale | 70 | 205
Cash & Cash Equivalents | 0 | 0
Current Marketable Securities | 70 | $ 205
Available-for-sale Securities | Other Sovereign Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 5 |
Available-for-sale, unrecognized loss | 0 |
Fair value, available-for-sale | 5 |
Cash & Cash Equivalents | 1 |
Current Marketable Securities | $ 4 |

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