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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income      
Balance at beginning of period $ (97)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 80us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 54us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Reclassification adjustments 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (66)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (62)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Deferred gain (loss) on cash flow hedges, net of tax (86)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 109us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 44us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Currency translation adjustments (288)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (220)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 44us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total period activity (370)us-gaap_OtherComprehensiveIncomeLossNetOfTax (177)us-gaap_OtherComprehensiveIncomeLossNetOfTax 26us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance at end of period (467)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (97)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 80us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Derivative Instruments      
Increase (Decrease) in Accumulated Other Comprehensive Income      
Balance at beginning of period (77)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(120)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(102)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Reclassification adjustments 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(66)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(62)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Deferred gain (loss) on cash flow hedges, net of tax (86)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
109us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
44us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Total period activity (82)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
43us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(18)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Balance at end of period (159)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(77)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
(120)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Translation Adjustments      
Increase (Decrease) in Accumulated Other Comprehensive Income      
Balance at beginning of period (20)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
200us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
156us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
Currency translation adjustments (288)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
(220)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
44us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
Total period activity (288)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
(220)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
44us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
Balance at end of period $ (308)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
$ (20)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
$ 200us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember