Financial Information for Subsidiary Guarantors and Non-guarantor Subsidiaries (Narrative) (Details) (Unsecured Debt [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Senior Notes, 6.125, Due in 2018 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate percentage (percent)	6.125%
Senior Notes, 5.50, Due in 2019 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate percentage (percent)	5.50%
Principal amount	$ 750

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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