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Pension Benefits - Schedule Of Reconciliation Of Level 3 Plan Assets Held (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
U.S. Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | $ 298 | $ 300
Fair value of plan assets at end of period | 262 | 298
U.S. Plans | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 18 | 16
Acquisitions | 0 | 0
Unrealized gain on plan assets still held | 1 | 2
Purchases, sales and settlements | (2) | 0
Fair value of plan assets at end of period | 17 | 18
U.S. Plans | Real Estate Funds |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 18 |
Fair value of plan assets at end of period | 17 | 18
U.S. Plans | Real Estate Funds | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 18 | 16
Acquisitions | 0 | 0
Unrealized gain on plan assets still held | 1 | 2
Purchases, sales and settlements | (2) | 0
Fair value of plan assets at end of period | 17 | 18
Non-U.S. Plans |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 612 | 590
Fair value of plan assets at end of period | 607 | 612
Non-U.S. Plans | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 30 | 12
Acquisitions | 0 | 0
Unrealized gain on plan assets still held | (3) | 1
Purchases, sales and settlements | 0 | 17
Fair value of plan assets at end of period | 27 | 30
Non-U.S. Plans | Real Estate Funds |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 26 |
Fair value of plan assets at end of period | 24 | 26
Non-U.S. Plans | Real Estate Funds | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 26 | 7
Acquisitions | 0 | 0
Unrealized gain on plan assets still held | (2) | 1
Purchases, sales and settlements | 0 | 18
Fair value of plan assets at end of period | 24 | 26
Non-U.S. Plans | Other | Level 3 |  |
Change in plan assets |  |
Fair value of plan assets at beginning of period | 4 | 5
Acquisitions | 0 | 0
Unrealized gain on plan assets still held | (1) | 0
Purchases, sales and settlements | 0 | (1)
Fair value of plan assets at end of period | $ 3 | $ 4

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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition The amount of increase in the plan assets attributed to a business combination. + 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 (b)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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