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Consolidated Statements of Operations Parenthetical (Parentheticals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Income tax benefit (expense) on discontinued operations $ 34us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ (15)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ (5)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation