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Benefit Plans (Assumed long-term healthcare cost trend rate) (Details) | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
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Postemployment Benefits [Abstract] |  |  |
Healthcare cost trend rate medical | 6.80% | 7.00% | 7.00%
Healthcare prescription drug | 6.80% | 7.00% | 7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 4.50% | 4.50% | 4.50%

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- Definition Ultimate trend rate for prescription drugs + References No definition available. + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + 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 (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- References No definition available. + Details
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