Derivative Instruments (Details) (USD $)	Mar. 31, 2014	Sep. 30, 2012
Derivative [Line Items]
Net derivative loss related to cash flow hedge included in accumulated other comprehensive income	$ 86,000,000
Foreign Exchange Contract
Derivative [Line Items]
Notional amount	4,800,000,000	5,700,000,000
Foreign Exchange Contract \| Cash Flow Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 1,800,000,000	$ 2,000,000,000

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

Name:	us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant