Hedging Activities - Derivative Instruments Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016
Derivatives Designated for Hedge Accounting
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	$ 140	$ 62
Fair value of derivative, liability	0	8
Derivatives Designated for Hedge Accounting \| Foreign Exchange Contract \| Prepaid Expenses and Other
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	17	16
Fair value of derivative, liability	0	0
U.S. Dollar notional amount, asset	80	80
Derivatives Designated for Hedge Accounting \| Foreign Exchange Contract \| Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	49	46
Fair value of derivative, liability	0	0
U.S. Dollar notional amount, asset	243	243
Derivatives Designated for Hedge Accounting \| Cross Currency Swap \| Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	74
Fair value of derivative, liability	0
U.S. Dollar notional amount, asset	1,011
Derivatives Designated for Hedge Accounting \| Cross Currency Swap \| Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset		0
Fair value of derivative, liability		8
U.S. Dollar notional amount, asset		546
Derivatives not Designated for Hedge Accounting
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	2	23
Fair value of derivative, liability	0	0
Derivatives not Designated for Hedge Accounting \| Foreign Exchange Contract \| Prepaid Expenses and Other
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	2	23
Fair value of derivative, liability	0	0
U.S. Dollar notional amount, asset	98	680
Derivatives not Designated for Hedge Accounting \| Foreign Exchange Contract \| Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	0	0
Fair value of derivative, liability	0	0
U.S. Dollar, notional amount, liability	$ 45	$ 196

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Publisher FASB
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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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+ References

No definition available.

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