| **Accumulated Other Comprehensive Income Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                |            |   |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                      | $ (12)          | $ 11 | $ 9 |
| Unrealized Gains (Losses) on Available-for-Sale Securities                                                                                                                    |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                |            |   |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                      | 0               | 0 | 0 |
| Unrealized Gains (Losses) on Derivative Instruments                                                                                                                           |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                |            |   |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                      | (12)            | 11 | 9 |
| Unrealized Gains (Losses) on Derivative Instruments | Sales Revenue, Net [Member]                                                                                             |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                |            |   |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                      | (23)            | (2) | 7 |
| Unrealized Gains (Losses) on Derivative Instruments | Research and Development                                                                                                |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                |            |   |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                      | $ 11            | $ 13 | $ 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.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581
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| X                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| 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:** |