| **Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions** | 3 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                         |           |   |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                | $ (16)         | $ 11 |
| Unrealized Gains (Losses) on Derivative Instruments [Member]                                                                           |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                         |           |   |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                | (16)           | 11 |
| Unrealized Gains (Losses) on Derivative Instruments [Member] | Sales Revenue, Net                                                      |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                         |           |   |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                | (19)           | 19 |
| Unrealized Gains (Losses) on Derivative Instruments [Member] | Research And Development [Member]                                       |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                         |           |   |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                | $ 3            | $ (8) |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
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| X                                                                                                                                                         |
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| X                                                                                                                                                                       |
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