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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income      
Currency translation adjustment $ 29 $ 29 $ 36
Unrealized gains on available-for-sale securities, net of income taxes of $0 and $0     1
Pension adjustment, net of income tax benefit of $(8) and $(8) (11) (11) (11)
Accumulated other comprehensive income 18 18 26
Accumulated Other Comprehensive Income (Loss)      
Unrealized gains on available for sale securities, income taxes 0 0 0
Pension adjustment, income tax (benefit) expense (8) (8) (8)
Accumulated other comprehensive income (loss) attributable to noncontrolling interests 0 0 0
Reclassifications      
Investments classified as available-for-sale securities 0    
Realized gains from sale of available-for-sale securities   1  
Realized losses from sale of available-for-sale securities   $ 1