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Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Cross Currency Swap | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Notional values designated for hedge accounting	$ 1,839		$ 1,839		$ 546
Forward Contract | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Notional values designated for hedge accounting	323		323		323
Forward Contract | Derivatives not Designated for Hedge Accounting
Derivative [Line Items]
Net (loss) gains from changes in fair value not designated for hedge accounting	(1)	$ (24)	4	$ (2)
U.S. dollar hedge against CAD cash flow | Forward Contract | Derivatives not Designated for Hedge Accounting
Derivative [Line Items]
Notional values designated for hedge accounting	882		882
Euro hedge against Pound and other European currency cash flows | Forward Contract | Derivatives not Designated for Hedge Accounting
Derivative [Line Items]
Notional values designated for hedge accounting	$ 99		$ 99		$ 876

X

- 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

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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