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v3.20.1

Summary of Significant Accounting Policies (Property Plant and Equipment and Internal Use Software Policy) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Capitalized internal-use software | $ 56 | $ 37
Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 1 year |
Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |
Buildings | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 20 years |
Buildings | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 25 years |
Computer equipment and software | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Computer equipment and software | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 6 years |
Equipment, Furniture and Fixtures, and Other [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Equipment, Furniture and Fixtures, and Other [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Leasehold Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 1 year |
Leasehold Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 15 years |
Computer Software, Intangible Asset [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Capitalized Internal-use Software, Estimated Useful Life | 3 years |

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- Definition Capitalized internal-use software + References No definition available. + Details
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- Definition Capitalized Internal-use Software, Estimated Useful Life + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
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- 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
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Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
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