Hedging Activities - Derivative Instruments Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2016	Mar. 31, 2016
Derivatives Designated for Hedge Accounting
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	$ 199	$ 62
Fair value of derivative, liability	0	8
Derivatives Designated for Hedge Accounting \| Foreign Exchange Forward Contract \| Prepaid Expenses and Other
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	18	16
Fair value of derivative, liability	0	0
U.S. Dollar notional amount, asset	80	80
Derivatives Designated for Hedge Accounting \| Foreign Exchange Forward Contract \| Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	51	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	130
Fair value of derivative, liability	0
U.S. Dollar notional amount, asset	1,839
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	5	23
Fair value of derivative, liability	0	0
Derivatives not Designated for Hedge Accounting \| Foreign Exchange Forward Contract \| Prepaid Expenses and Other
Derivatives, Fair Value [Line Items]
Fair value of derivative, asset	5	23
Fair value of derivative, liability	0	0
U.S. Dollar notional amount, asset	943	680
Derivatives not Designated for Hedge Accounting \| Foreign Exchange Forward 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	$ 38	$ 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
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-Name Accounting Standards Codification
-Topic 815
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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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
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Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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