Guarantor Financial Information Narrative (Details) - 6.000% Senior Notes due 2024 [$1.0B] [Member] $ in Billions	Sep. 30, 2016 USD ($)
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 1.0
Interest rate, stated percentage	6.00%
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term debt	$ 1.0
Interest rate, stated percentage	6.00%

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 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: 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=64930785&loc=d3e28551-108399

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