| **Balance Sheet Details (Accrued And Other Current Liabilities Schedule) (Details) - USD ($) $ in Millions** | Sep. 30, 2016 | Mar. 31, 2016 |
|--------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Balance Sheet Related Disclosures [Abstract]**                                                             |          |          |  |
| Other accrued expenses                                                                                       | $ 289         | $ 218         |  |
| Accrued compensation and benefits                                                                            | 175           | 256           |  |
| Accrued royalties                                                                                            | 162           | 159           |  |
| Deferred net revenue (other)                                                                                 | 151           | 77            |  |
| Accrued and other current liabilities                                                                        | $ 777         | $ 710         | [1] |
|                                                                                                              |
| [1]Derived from audited Consolidated Financial Statements.                                                   |

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| - Definition
The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue and which are expected to recognized as such within one year or the normal operating cycle, including subscription revenue, deferrals related to our Switzerland distribution business, advertising revenue, licensing arrangements, and other revenue for which revenue recognition criteria has not been met, but excluding online-enabled packaged goods and digital content.
+ References
No definition available.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - References
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| - Definition
Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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| - Definition
Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
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