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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 27 $ 33 $ 68 $ 74
Other comprehensive income (loss):        
Currency translation adjustments 18    1 (18)
Comprehensive income $ 45 $ 33 $ 69 $ 56