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Commitments (Tables)
12 Months Ended
Dec. 31, 2011
Commitments [Abstract]  
Total estimated minimum long-term obligations
                 
    Commitments
      Natural Gas   Coal   Nuclear Fuel   Purchased Power*  

 

    (in millions)
         

2012

  $1,479   $3,266   $   353          $   259   

2013

    1,553     2,218   197       248

2014

    1,196     1,336   206       281

2015

      998       592   145       311

2016

      937       300     92       301

2017 and thereafter

   2,798       737   740     2,700 

 

Total

  $8,961   $8,449   $1,733          $4,100   

 

 

* Certain PPAs reflected in the table are accounted for as operating leases.
Estimated minimum lease payments for noncancelable operating leases
                 
    Minimum Lease Payments

 

    Barges & Rail Cars   Other   Total  

 

    (in millions)

2012

  $  79     $  42     $121    

2013

    68     34     102    

2014

    53     28       81    

2015

    21     22       43    

2016

    15     17       32    

2017 and thereafter

    10     75       85    

 

Total

  $246     $218     $464