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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 698us-gaap_NetIncomeLoss $ 682us-gaap_NetIncomeLoss $ 537us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax -      
Unrecognized amounts on retirement benefits, net of tax of $(3), $1 and $(2) (4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Comprehensive income $ 694us-gaap_ComprehensiveIncomeNetOfTax $ 685us-gaap_ComprehensiveIncomeNetOfTax $ 534us-gaap_ComprehensiveIncomeNetOfTax