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Goodwill And Other Intangibles (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill And Other Intangibles [Abstract]  
Changes In Goodwill Balances
Identifiable Intangible Assets
    

2011

   

2010

 

In millions at

December 31

 

Gross

Carrying

Amount

    Accumulated
Amortization
   

Gross

Carrying

Amount

   

Accumulated

Amortization

 

Customer relationships and lists

  $ 227      $ 82      $ 245      $ 74   

Non-compete agreements

    72        19        20        18   

Tradenames, patents and trademarks

    51        21        33        10   

Land and water rights

    60        3        24        3   

Fuel and power agreements

    30        16        21        12   

Software

    37        29        38        25   

Other

    27        13        40        18   

Total (a)

  $ 504      $ 183      $ 421      $ 160   
Amortization Expense Of Intangible Assets
In millions    2011      2010      2009  

Amortization expense related to intangible assets

   $ 32       $ 31       $ 34