XML 130 R51.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Postretirement Benefits (Tables) (Other Postretirement Benefit Plan, Defined Benefit [Member]) | 12 Months Ended
--- | ---
Mar. 31, 2015
Other Postretirement Benefit Plan, Defined Benefit [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Expense (Income) for Postretirement Welfare Benefits | The net periodic expense for our postretirement welfare benefits is as follows:
| Years Ended March 31,
(In millions) | 2015 |  | 2014 |  | 2013
Service cost - benefits earned during the year | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost on accumulated benefit obligation | 5 |  |  | 5 |  |  | 6 |
Amortization of unrecognized actuarial gain and prior service credit | (4 | ) |  | (1 | ) |  | (2 | )
Curtailment gain | — |  |  | (2 | ) |  | — |
Net periodic postretirement expense | $ | 2 |  |  | $ | 4 |  |  | $ | 6 |
Schedule of Changes in Benefit Obligations for Postretirement Welfare Plans | Information regarding the changes in benefit obligations for our postretirement welfare plans is as follows:
| Years Ended March 31,
(In millions) | 2015 |  | 2014
Benefit obligation at beginning of period | $ | 119 |  |  | $ | 131 |
Service cost | 1 |  |  | 2 |
Interest cost | 5 |  |  | 5 |
Actuarial loss (gain) | 5 |  |  | (2 | )
Benefit payments | (12 | ) |  | (15 | )
Curtailment gain | — |  |  | (2 | )
Benefit obligation at end of period | $ | 118 |  |  | $ | 119 |

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration