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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Financial Instruments [Abstract]  
Carrying and estimated fair value
 
                                 
    June 30, 2011   December 31, 2010
    Carrying Amount   Fair Value   Carrying Amount   Fair Value
    (Millions)
 
Long-term debt (including current maturities)
  $ 1,230     $ 1,265     $ 1,162     $ 1,201  
Instruments with off-balance sheet risk:
                               
Foreign exchange forward contracts
                2       2  
Foreign exchange forward contracts fair value on gross basis
 
                                                 
    Fair Value of Derivative Instruments
    June 30, 2011   December 31, 2010
    Asset
  Liability
      Asset
  Liability
   
    Derivatives   Derivatives   Total   Derivatives   Derivatives   Total
    (Millions)
 
Foreign exchange forward contracts
  $     $     $     $ 2     $     $ 2  
Fair value of financial assets on recurring basis
 
                                                 
    June 30, 2011   December 31, 2010
    Level 1   Level 2   Level 3   Level 1   Level 2   Level 3
    (Millions)
 
Financial Assets:
                                               
Foreign exchange forward contracts
    n/a     $       n/a       n/a     $ 2       n/a  
Summarization for foreign currency forward purchase and sale contracts
 
             
        Notional Amount
        in Foreign Currency
        (Millions)
 
Australian dollars
  —Purchase     2  
British pounds
  —Purchase     4  
European euro
  —Sell     (12 )
Japanese Yen
  —Purchase     532  
South African rand
  —Purchase     164  
U.S. dollars
  —Purchase     14  
    —Sell     (22 )
Other
  —Purchase     1  
    —Sell     (13 )