Schedule I - Condensed Financial Information of Parent (Balance Sheet Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Parent Company
Condensed Financial Statements, Captions [Line Items]
Deferred financing costs, accumulated amortization	$ 75	$ 81

Carrying amount of accumulated amortization of long-term deferred finance costs capitalized at the end of the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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