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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 63us-gaap_NetIncomeLoss $ 68us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Foreign currency translation adjustments (28)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax [1] 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax [1]
Total other comprehensive income (loss) (28)us-gaap_OtherComprehensiveIncomeLossBeforeTax 1us-gaap_OtherComprehensiveIncomeLossBeforeTax
Comprehensive income $ 35us-gaap_ComprehensiveIncomeNetOfTax $ 69us-gaap_ComprehensiveIncomeNetOfTax
[1] Foreign currency translation adjustments exclude income taxes due to our practice and intention to indefinitely reinvest the earnings of our foreign subsidiaries in those operations.