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.

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

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt and Financing Activities - Long Term Debt (Details) € in Millions, $ in Millions			3 Months Ended	6 Months Ended
	Oct. 18, 2016 EUR (€)	Oct. 18, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt outstanding				$ 8,107		$ 8,107
Debt repaid				6	$ 498
Term Loan \| Floating Rate Notes Due September Tenth Two Thousand Fifteen
Debt Instrument [Line Items]
Debt repaid			$ 400
Term Loan \| Subsequent Event \| Bonds
Debt Instrument [Line Items]
Debt repaid	€ 350	$ 385
Current Portion of Long-term Debt
Debt Instrument [Line Items]
Long-term debt outstanding				$ 2,166		$ 1,610