|
Fair Value Measurements 3 (Details) (USD $)
In Millions, unless otherwise specified
|
9 Months Ended |
12 Months Ended |
|
Dec. 31, 2014
|
Mar. 31, 2014
|
| Cash and Cash Equivalents [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents, Fair value disclosure |
515 |
1,277 |
| Other Noncurrent Assets, Net [Member] | Money Market Funds [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Other noncurrent assets, net, Fair value disclosure |
less than $1 million |
less than $1 million |
| Accrued Expenses and Other Current Liabilities [Member] | Facility Exit [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Accrued expenses and other current liabilities, Fair value disclosure |
8 |
11 |
| Other Noncurrent Liabilities [Member] | Facility Exit [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Other noncurrent liabilities, Fair value disclosure |
13 |
18 |