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Description Of Business And Summary Of Significant Accounting Policies (Property Plant and Equipment and Internal Use Software Policy) (Details) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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| Property, Plant and Equipment [Line Items] |
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| Capitalized internal-use software |
62 |
$ 74 |
| Buildings | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
20 years |
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| Buildings | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
25 years |
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| Computer, equipment and software | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
3 years |
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| Computer, equipment and software | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
6 years |
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| Office Equipment, Furniture and Fixtures [Member] | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
3 years |
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| Office Equipment, Furniture and Fixtures [Member] | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
5 years |
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| Warehouse Equipment and Other [Member] | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
5 years |
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| Warehouse Equipment and Other [Member] | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
5 years |
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| Leasehold Improvements [Member] | Minimum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
1 year |
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| Leasehold Improvements [Member] | Maximum [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Property, Plant and Equipment, Useful Life |
10 years |
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| Computer Software, Intangible Asset [Member] |
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| Property, Plant and Equipment [Line Items] |
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| Capitalized Internal-use Software, Estimated Useful Life |
3 years |
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