Hedging Activities - Schedule of Information Regarding Fair Value of Derivatives on a Gross Basis (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Derivatives designated for hedge accounting
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	$ 29	$ 156
Fair value of derivative liability, gross fair value	229	0
Derivatives not designated for hedge accounting
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	0	1
Fair value of derivative liability, gross fair value	0	0
Foreign Exchange Contract \| Derivatives designated for hedge accounting \| Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	15	17
Fair value of derivative liability, gross fair value	0	0
Derivative asset, notional amount	81	81
Foreign Exchange Contract \| Derivatives designated for hedge accounting \| Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	14	32
Fair value of derivative liability, gross fair value	0	0
Derivative asset, notional amount	81	162
Foreign Exchange Contract \| Derivatives not designated for hedge accounting \| Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	0	1
Fair value of derivative liability, gross fair value	0	0
Derivative asset, notional amount	13	198
Foreign Exchange Contract \| Derivatives not designated for hedge accounting \| Other accrued liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	0	0
Fair value of derivative liability, gross fair value	0	0
Derivative liability, notional amount	16	37
Currency Swap \| Derivatives designated for hedge accounting \| Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	0	17
Fair value of derivative liability, gross fair value	7	0
Derivative asset, notional amount	504
Derivative liability, notional amount		174
Currency Swap \| Derivatives designated for hedge accounting \| Other Noncurrent Assets/Liabilities
Derivatives, Fair Value [Line Items]
Fair value of derivative asset, gross fair value	0	90
Fair value of derivative liability, gross fair value	222	0
Derivative asset, notional amount	$ 3,508
Derivative liability, notional amount		$ 2,489

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=84234895&loc=SL5579245-113959

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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
-Publisher FASB
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