Consolidated Condensed Statements of Cash Flows (Unaudited) (Parenthetical) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Consolidated Condensed Statements of Cash Flows [Abstract]
Net of cash received from interest rate swaps	$ 12	$ 12

The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 23
-Name Accounting Standards Codification
-Publisher FASB
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3505-108585

Name:	us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration