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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Accumulated Other Comprehensive Income        
Currency translation adjustment $ 25 $ 25   $ 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 (loss) 14 14   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
Realized gains from sale of available-for-sale securities 1 1 1  
Realized losses from sale of available-for-sale securities $ 1 $ 1