v2.4.0.6
Shareholders' Equity (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the end of the period $ 583 $ 319  
Accumulated Other Comprehensive Income (Loss)
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period 319 (811) 669
Other comprehensive income (loss), net of tax 264 1,130 (1,480)
Balance at the end of the period 583 319 (811)
Foreign Exchange Translation Adjustment
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period 423 (639) 707
Other comprehensive income (loss), net of tax 247 1,062 (1,346)
Balance at the end of the period 670 423 (639)
Deferred Gain (Loss) on Hedging Activities
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period (5) (80) 12
Other comprehensive income (loss), net of tax 3 75 (92)
Balance at the end of the period (2) (5) (80)
Treasury Rate Lock Contracts
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period (7) (9) (11)
Other comprehensive income (loss), net of tax 7 2 2
Balance at the end of the period   (7) (9)
Pension and Other Postretirement Liability Adjustment
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period (90) (79) (43)
Other comprehensive income (loss), net of tax 7 (11) (36)
Balance at the end of the period (83) (90) (79)
Unrealized Gain (Loss) on Investments
      
Accumulated Other Comprehensive Income (Loss) Net of Tax      
Balance at the beginning of the period   (4) 4
Other comprehensive income (loss), net of tax   2 (8)
Balance at the end of the period $ (2) $ (2) $ (4)