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Pension Benefits - Schedule Of Changes In Benefit Obligations And Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
United States |  |  |
Change in benefit obligations |  |  |
Benefit obligation at beginning of period | $ 439 | $ 485 |
Service cost | 0 | 0 | $ 3
Interest cost | 6 | 14 | 14
Actuarial loss (gain) | 20 | 4 |
Benefits paid | (179) | (64) |
Annuity Premium Transfer | (276) | 0 |
Expenses paid | 0 | 0 |
Acquisitions | 0 | 0 |
Foreign exchange impact and other | 0 | 0 |
Benefit obligation at end of period | 10 | 439 | 485
Change in plan assets |  |  |
Fair value of plan assets at beginning of period | 322 | 335 |
Actual return on plan assets | 27 | 12 |
Employer and participant contributions | 116 | 39 |
Benefits paid | (179) | (64) |
Annuity Premium Transfer | (276) | 0 |
Expenses paid | 0 | 0 |
Foreign exchange impact and other | (10) | 0 |
Fair value of plan assets at end of period | 0 | 322 | 335
Funded status at end of period | (10) | (117) |
Amounts recognized on the balance sheet |  |  |
Assets | 0 | 7 |
Current liabilities | (1) | (115) |
Long-term liabilities | (9) | (9) |
Total | (10) | (117) |
Non-U.S. Plans |  |  |
Change in benefit obligations |  |  |
Benefit obligation at beginning of period | 990 | 1,035 |
Service cost | 16 | 15 | 15
Interest cost | 19 | 21 | 22
Actuarial loss (gain) | (36) | 35 |
Benefits paid | (43) | (36) |
Annuity Premium Transfer | 0 | 0 |
Expenses paid | 0 | (1) |
Acquisitions | 2 | 1 |
Foreign exchange impact and other | (52) | (80) |
Benefit obligation at end of period | 896 | 990 | 1,035
Change in plan assets |  |  |
Fair value of plan assets at beginning of period | 642 | 687 |
Actual return on plan assets | 3 | 18 |
Employer and participant contributions | 28 | 23 |
Benefits paid | (43) | (36) |
Annuity Premium Transfer | 0 | 0 |
Expenses paid | (1) | (1) |
Foreign exchange impact and other | (35) | (49) |
Fair value of plan assets at end of period | 594 | 642 | $ 687
Funded status at end of period | (302) | (348) |
Amounts recognized on the balance sheet |  |  |
Assets | 49 | 20 |
Current liabilities | (162) | (13) |
Long-term liabilities | (189) | (355) |
Total | $ (302) | $ (348) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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