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Postretirement Benefits (Tables) | 12 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Schedule of net periodic (credit) expense for postretirement welfare benefits | The net periodic expense for our pension plans is as follows:
| U.S. Plans |  | Non-U.S. Plans
| Years Ended March 31, |  | Years Ended March 31,
(In millions) | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Service cost - benefits earned during the year | $ | 3 |  |  | $ | 5 |  |  | $ | 4 |  |  | $ | 15 |  |  | $ | 15 |  |  | $ | 20 |
Interest cost on projected benefit obligation | 14 |  |  | 13 |  |  | 18 |  |  | 22 |  |  | 23 |  |  | 24 |
Expected return on assets | (19 | ) |  | (15 | ) |  | (19 | ) |  | (26 | ) |  | (26 | ) |  | (30 | )
Amortization of unrecognized actuarial loss and prior service costs | 6 |  |  | 11 |  |  | 42 |  |  | 5 |  |  | 4 |  |  | 3 |
Curtailment/settlement loss (gain) | 2 |  |  | — |  |  | 2 |  |  | 1 |  |  | (2 | ) |  | — |
Net periodic pension expense | $ | 6 |  |  | $ | 14 |  |  | $ | 47 |  |  | $ | 17 |  |  | $ | 14 |  |  | $ | 17 |
The net periodic (credit) expense for our postretirement welfare benefits is as follows:
| Years Ended March 31,
(In millions) | 2018 |  | 2017 |  | 2016
Service cost - benefits earned during the year | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost on accumulated benefit obligation | 2 |  |  | 2 |  |  | 4 |
Amortization of unrecognized actuarial gain and prior service credit | (6 | ) |  | (1 | ) |  | — |
Net periodic postretirement (credit) expense | $ | (3 | ) |  | $ | 2 |  |  | $ | 5 |
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) | 2018 |  | 2017
Benefit obligation at beginning of period | $ | 82 |  |  | $ | 98 |
Service cost | 1 |  |  | 1 |
Interest cost | 2 |  |  | 2 |
Actuarial gain | (1 | ) |  | (13 | )
Benefit payments | (6 | ) |  | (6 | )
Benefit obligation at end of period | $ | 78 |  |  | $ | 82 |

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- 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=82843861&loc=d3e1928-114920 + Details
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- 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=82843861&loc=d3e1928-114920 + Details
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