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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
Statement of Comprehensive Income [Abstract]      
Net income $ 116us-gaap_NetIncomeLoss $ 147us-gaap_NetIncomeLoss $ 108us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Currency translation adjustments (45)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent (18)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 9us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Comprehensive income $ 71us-gaap_ComprehensiveIncomeNetOfTax $ 129us-gaap_ComprehensiveIncomeNetOfTax $ 117us-gaap_ComprehensiveIncomeNetOfTax