| **Financial Instruments - Investments (Details) - USD ($) $ in Millions**        | Mar. 29, 2020 | Dec. 31, 2019 |
|----------------------------------------------------------------------------------|---------------|---------------|
| **Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]**           |               |          |   |
| Debt securities, amortized cost                                                  |               | $ 4,823       | $ 8,380 |
| Debt securities, gross unrealized gains                                          |               | 1             | 6 |
| Debt securities, gross unrealized losses                                         |               | (77)          | (47) |
| Available-for-sale securities and held-to-maturity securities                    |               | 4,746         | 8,340 |
| Debt securities maturities, within 1 year, fair value                            |               | 4,410         |   |
| Debt securities maturities, over 1 to 5 years, fair value                        |               | 304           |   |
| Debt securities maturities, over 5 years, fair value                             |               | 32            |   |
| Government and agency - non U.S. [Member]                                        |               |          |   |
| **Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]** |               |          |   |
| Available-for-sale debt securities, amortized cost                               |               | 2,056         | 4,895 |
| Available-for-sale debt securities, gross unrealized gains                       |               | 0             | 6 |
| Available-for-sale debt securities, gross unrealized losses                      |               | (67)          | (38) |
| Available-for-sale debt securities, fair value                                   |               | 1,989         | 4,863 |
| **Available-for-sale Securities, Debt Maturities [Abstract]**                    |               |          |   |
| Available-for-sale securities, debt maturities, within 1 year, fair value        |               | 1,989         |   |
| Available-for-sale securities, debt maturities, over 1 to 5 years, fair value    |               | 0             |   |
| Available-for-sale securities, debt maturities, over 5 years, fair value         |               | 0             |   |
| Available-for-sale debt securities, fair value                                   |               | 1,989         | 4,863 |
| **Debt Securities, Held-to-maturity, Maturity [Abstract]**                       |               |          |   |
| Held-to-maturity securities, debt maturities, total                              |               | 1,014         | 803 |
| Held-to-maturity securities, gross unrealized gains                              |               | 0             | 0 |
| Held-to-maturity securities, gross unrealized losses                             |               | 0             | 0 |
| Held-to-maturity securities, fair value                                          |               | 1,014         | 803 |
| **Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]**           |               |          |   |
| Held-to-maturity securities, debt maturities, within 1 year, fair value          |               | 1,010         |   |
| Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value      |               | 0             |   |
| Held-to-maturity securities, debt maturities, over 5 years, fair value           |               | 4             |   |
| Held-to-maturity securities, debt maturities, total                              |               | 1,014         | 803 |
| Government and agency - U.S. [Member]                                            |               |          |   |
| **Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]** |               |          |   |
| Available-for-sale debt securities, amortized cost                               |               | 305           | 1,120 |
| Available-for-sale debt securities, gross unrealized gains                       |               | 0             | 0 |
| Available-for-sale debt securities, gross unrealized losses                      |               | (4)           | (6) |
| Available-for-sale debt securities, fair value                                   |               | 302           | 1,114 |
| **Available-for-sale Securities, Debt Maturities [Abstract]**                    |               |          |   |
| Available-for-sale securities, debt maturities, within 1 year, fair value        |               | 16            |   |
| Available-for-sale securities, debt maturities, over 1 to 5 years, fair value    |               | 285           |   |
| Available-for-sale securities, debt maturities, over 5 years, fair value         |               | 0             |   |
| Available-for-sale debt securities, fair value                                   |               | 302           | 1,114 |
| Corporate and other [Member]                                                     |               |          |   |
| **Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]** |               |          |   |
| Available-for-sale debt securities, amortized cost                               | [1]           | 823           | 1,027 |
| Available-for-sale debt securities, gross unrealized gains                       | [1]           | 0             | 0 |
| Available-for-sale debt securities, gross unrealized losses                      | [1]           | (6)           | (2) |
| Available-for-sale debt securities, fair value                                   | [1]           | 817           | 1,025 |
| **Available-for-sale Securities, Debt Maturities [Abstract]**                    |               |          |   |
| Available-for-sale securities, debt maturities, within 1 year, fair value        | [1]           | 807           |   |
| Available-for-sale securities, debt maturities, over 1 to 5 years, fair value    | [1]           | 11            |   |
| Available-for-sale securities, debt maturities, over 5 years, fair value         | [1]           | 0             |   |
| Available-for-sale debt securities, fair value                                   | [1]           | 817           | 1,025 |
| Time deposits and other [Member]                                                 |               |          |   |
| **Debt Securities, Held-to-maturity, Maturity [Abstract]**                       |               |          |   |
| Held-to-maturity securities, debt maturities, total                              |               | 624           | 535 |
| Held-to-maturity securities, gross unrealized gains                              |               | 0             | 0 |
| Held-to-maturity securities, gross unrealized losses                             |               | 0             | 0 |
| Held-to-maturity securities, fair value                                          |               | 624           | 535 |
| **Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]**           |               |          |   |
| Held-to-maturity securities, debt maturities, within 1 year, fair value          |               | 589           |   |
| Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value      |               | 8             |   |
| Held-to-maturity securities, debt maturities, over 5 years, fair value           |               | 28            |   |
| Held-to-maturity securities, debt maturities, total                              |               | $ 624         | $ 535 |
|                                                                                  |
| [1]Primarily issued by a diverse group of corporations.                          |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| - Definition
Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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| - Definition
Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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| - Definition
Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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| - Definition
Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.
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