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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Fair Value, Assets And Liabilities Measured On Recurring Basis
     December 31, 2011      December 31, 2010  
    (In millions)    Total      Level 1      Level 2      Total      Level 1      Level 2  

Assets

                  

Equity securities (a)

   $ 91       $ 91       $ —         $ 86       $ 86       $ —     

Mutual funds (a)

     380         380         —           450         450         —     

U.S. Government securities (b)

     211         —           211         719         —           719   

Other securities (b)

     102         —           102         104         —           104   

Derivative assets (c)

     43         —           43         26         —           26   

Liabilities

                  

Derivative liabilities (c)

     26         —           26         33         —           33   

 

(a) 

Equity securities and interests in mutual funds are valued using quoted market prices.

(b) 

U.S. Government securities and other securities, which consist primarily of corporate debt securities, U.S. Government-sponsored enterprise securities, and mortgage-backed securities, are valued based on inputs other than quoted prices that are observable for the asset (e.g., interest rates and yield curves observable at commonly quoted intervals).

(c) 

Derivative assets and liabilities relate to foreign currency exchange and interest rate swap contracts and are valued based on observable market prices (e.g., interest rates and yield curves observable at commonly quoted intervals), but are not exchanged in an active market.