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Cash, cash equivalents and current marketable securities - Cash and Cash Equivalent Composition (Details) - USD ($) $ in Millions | Dec. 29, 2024 | Dec. 31, 2023
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Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Fair value, available-for-sale | $ 7,216 | $ 8,874
Cash & Cash Equivalents | 24,105 | 21,859
Current Marketable Securities | 417 | 1,068
Held-to-maturity Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 17,306 | 14,053
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 17,306 | 14,053
Cash & Cash Equivalents | 17,186 | 13,556
Current Marketable Securities | 120 | 497
Held-to-maturity Securities | Cash |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 2,918 | 3,340
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 2,918 | 3,340
Cash & Cash Equivalents | 2,918 | 3,340
Current Marketable Securities | 0 | 0
Held-to-maturity Securities | Non-U.S. Sovereign Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 120 | 522
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 120 | 522
Cash & Cash Equivalents | 0 | 174
Current Marketable Securities | 120 | 348
Held-to-maturity Securities | U.S. Reverse repurchase agreements |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 7,100 | 4,377
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 7,100 | 4,377
Cash & Cash Equivalents | 7,100 | 4,377
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
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity |  | 338
Cash & Cash Equivalents |  | 189
Current Marketable Securities |  | 149
Held-to-maturity Securities | Money market funds |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 6,123 | 4,814
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 6,123 | 4,814
Cash & Cash Equivalents | 6,123 | 4,814
Current Marketable Securities | 0 | 0
Held-to-maturity Securities | Time deposits |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, held-to-maturity | 1,045 | 662
Held-to-maturity, unrecognized gain | 0 |
Held-to-maturity, unrecognized loss |  | 0
Fair value, held-to-maturity | 1,045 | 662
Cash & Cash Equivalents | 1,045 | 662
Current Marketable Securities | 0 | 0
Available-for-sale Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 7,215 | 8,875
Available-for-sale, unrealized gain | 1 |
Available-for-sale, unrecognized loss |  | (1)
Fair value, available-for-sale | 7,216 | 8,874
Cash & Cash Equivalents | 6,919 | 8,303
Current Marketable Securities | 297 | 571
Available-for-sale Securities | Corporate debt securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 224 | 237
Available-for-sale, unrealized gain | 0 |
Available-for-sale, unrecognized loss |  |
Fair value, available-for-sale | 224 | 237
Cash & Cash Equivalents | 40 | 43
Current Marketable Securities | 184 | 194
Available-for-sale Securities | U.S. Gov't Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 6,815 | 8,562
Available-for-sale, unrealized gain | 1 |
Available-for-sale, unrecognized loss |  | 0
Fair value, available-for-sale | 6,816 | 8,562
Cash & Cash Equivalents | 6,796 | 8,259
Current Marketable Securities | 20 | 303
Available-for-sale Securities | U.S. Gov't Agencies |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale |  | 71
Available-for-sale, unrecognized loss |  | (1)
Fair value, available-for-sale |  | 70
Cash & Cash Equivalents |  | 0
Current Marketable Securities |  | 70
Available-for-sale Securities | Other Sovereign Securities |  |
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |
Carrying Amount, available-for-sale | 176 | 5
Available-for-sale, unrealized gain | 0 |
Available-for-sale, unrecognized loss |  | 0
Fair value, available-for-sale | 176 | 5
Cash & Cash Equivalents | 83 | 1
Current Marketable Securities | $ 93 | $ 4

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