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Pension And Other Postretirement Benefit Plans (Tables)
6 Months Ended
Dec. 31, 2011
Components Of Net Periodic Benefit Cost
Postretirement Medical And Life Insurance [Member]
 
Components Of Net Periodic Benefit Cost
     Postretirement Medical  and
Life Insurance
 

(In millions)

   Second
Quarter
2012
    Second
Quarter
2011
    Six
Months
2012
    Six
Months
2011
 

Service cost

   $ 1      $ —        $ 1      $ 1   

Interest cost

     1        2        2        3   

Amortization of:

        

Prior service cost (benefit)

     (3     (3     (6     (6
  

 

 

   

 

 

   

 

 

   

 

 

 

Net periodic benefit cost (benefit)

   $ (1   $ (1   $ (3   $ (2