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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)    
Net income (loss) $ (469)us-gaap_ProfitLoss $ 466us-gaap_ProfitLoss
Net income (loss) attributable to noncontrolling interest 14us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 10us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to controlling interest (483)us-gaap_NetIncomeLoss 456us-gaap_NetIncomeLoss
Other comprehensive income (loss) before reclassifications    
Components of net periodic benefit costs (13)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax (5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax
Reclassifications to net income    
Components of net periodic benefit costs 5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax 6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax
(Gain) loss on derivative instruments   (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
Other comprehensive income (loss) before income taxes (8)us-gaap_OtherComprehensiveIncomeLossBeforeTax (1)us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income taxes related to other comprehensive income (loss) (2)us-gaap_OtherComprehensiveIncomeLossTax  
Other comprehensive income (loss), net of income taxes (10)us-gaap_OtherComprehensiveIncomeLossNetOfTax (1)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) attributable to controlling interest (10)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Total comprehensive income (loss) (479)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 465us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Total comprehensive income attributable to noncontrolling interest 14us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 10us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Total comprehensive income (loss) attributable to controlling interest $ (493)us-gaap_ComprehensiveIncomeNetOfTax $ 455us-gaap_ComprehensiveIncomeNetOfTax