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Hedging Activities - Narrative (Details) £ in Millions, $ in Millions, € in Billions	3 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 GBP (£)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Derivative [Line Items]
Long-term debt outstanding				$ 7,949	$ 8,362
Foreign Exchange Contract | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Notional values of financial instruments				243	243
Foreign Exchange Contract | Derivatives not Designated for Hedge Accounting
Derivative [Line Items]
Notional values of financial instruments				167	62
Cross Currency Swap | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Notional values of financial instruments				3,223	2,663
Forward Contracts | Derivatives not Designated for Hedge Accounting
Derivative [Line Items]
Notional values of financial instruments				$ 177	$ 173
Net Investment Hedging
Derivative [Line Items]
Losses from net investment hedges recorded in other comprehensive income	$ 114
Euro Denominated Notes | Term Loan
Derivative [Line Items]
Long-term debt outstanding | €		€ 1.2
British Pound Sterling Denominated Notes | Term Loan
Derivative [Line Items]
Long-term debt outstanding | £			£ 450

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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