Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (51)us-gaap_NetIncomeLoss	$ 39us-gaap_NetIncomeLoss
Other comprehensive income, net of tax (see Note 12)	3	3
Comprehensive income (loss)	$ (48)us-gaap_ComprehensiveIncomeNetOfTax	$ 42us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration