| **(Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Millions** | Dec. 31, 2017 | Mar. 31, 2017 |
|----------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Other liabilities | Fair Value, Inputs, Level 3 [Member] | Contingent consideration                            |          |          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis**                            |          |          |
| Accrued Liabilities, Fair Value Disclosure                                                                     | $ 122         | $ 0           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of accrued expenses.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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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.
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