| **Balance Sheet Details (Narrative) (Details) - USD ($) $ in Millions**                                   | 3 Months Ended | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Deferred Revenue Arrangement [Line Items]**                                                             |           |           |   |   |
| Depreciation expense                                                                                      | $ 46           | $ 41           | $ 135 | $ 120 |
| Recognition of revenue deferral                                                                           |           |           | $ 2,124 | $ 1,607 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |           |           |   |   |
| **Deferred Revenue Arrangement [Line Items]**                                                             |           |           |   |   |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period                        | 12 months      |           | 12 months |   |
| Total deferred revenue [Member]                                                                           |           |           |   |   |
| **Deferred Revenue Arrangement [Line Items]**                                                             |           |           |   |   |
| Revenue, Remaining Performance Obligation, Amount                                                         | $ 1,961        |           | $ 1,961 |   |

| 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 of revenue recognized that was previously reported as deferred or unearned revenue.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of transaction price allocated to performance obligation that has not been recognized as revenue.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                  |
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