| **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)                                                                | $ (3)          | $ 5 |
| Unrealized Gains (Losses) on Derivative Instruments [Member]                                                                           |           |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                         |           |   |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                | (3)            | 5 |
| 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)                                                                | (8)            | 3 |
| 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)                                                                | $ 5            | $ 2 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
No definition available.
+ Details**Name:**us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeStatementLocationAxis=us-gaap_SalesRevenueNetMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |