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Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2012
Benefit Plans Tables [Abstract]  
Schedule of Net Benefit Costs [Tables]
PROGRESS ENERGY     
  Pension Benefits  OPEB
(in millions)2012  2011  2012  2011
Service cost$ 16 $ 13 $ 3 $ 3
Interest cost  33   35   10   10
Expected return on plan assets  (46)   (45)   -   -
Amortization of actuarial loss(a)  23   14   6   3
Other amortization, net(a)  2   2   1   1
 Net periodic cost$ 28 $ 19 $ 20 $ 17
             
(a) Adjusted to reflect PEF’s rate treatment. See Note 17B in the 2011 Form 10-K.