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Fair Value Disclosures (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Line Items]  
Fair value measurements- assets and liabilities
PROGRESS ENERGY           
(in millions) Total  Level 1  Level 2  Level 3
September 30, 2012           
Nuclear decommissioning trust fund equity securities$ 1,226 $ 1,220 $ 6 $ -
Nuclear decommissioning trust fund debt securities and other  618   131   487   -
Other long-term available-for-sale debt securities and other(a)  60   21   39   -
Derivative assets(b)  1   -   1   -
 Total assets  1,905   1,372   533   -
Derivative liabilities(c)  (435)   -   (399)   (36)
 Net assets$ 1,470 $ 1,372 $ 134 $ (36)
             
(in millions) Total  Level 1  Level 2  Level 3
December 31, 2011           
Nuclear decommissioning trust fund equity securities$ 1,062 $ 1,061 $ 1 $ -
Nuclear decommissioning trust fund debt securities and other  585   87   498   -
Other long-term available-for-sale debt securities and other(a)  20   20   -   -
Derivative assets(b)  5   -   5   -
 Total assets  1,672   1,168   504   -
Derivative liabilities(c)  (799)   -   (775)   (24)
 Net assets$ 873 $ 1,168 $ (271) $ (24)
             
(a) Included in Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b) Included in Prepayments and Other Current Assets within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(c) Included in Derivative Liabilities within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets.
             
Fair value, liabilities measured on recurring basis, unobservable input reconciliation
PROGRESS ENERGY
 Three months ended September 30 Nine months ended September 30
(in millions) 2012  2011  2012  2011
Derivatives, net at beginning of period$ 30 $ 37 $ 24 $ 36
Total pre-tax realized or unrealized gains included in earnings − regulated electric  (2)   -   (2)   -
Total (gains) losses, included in the consolidated Balance Sheet as regulatory asset or liability  (4)   6   2   7
Issuances  16   -   16   -
Settlements  (4)   -   (4)   -
Transfers into Level 3 − CVOs  -   74   -   74
Derivatives, net at end of period$ 36 $ 117 $ 36 $ 117
            
Fair value inputs liabilities quantitative information
PROGRESS ENERGY
(in millions)Fair Value Valuation Technique Unobservable Input  Range
September 30, 2012           
Commodity natural gas hedges$ 27 Discounted cash flow Forward natural gas curves - price per MMBtu $ 4.178- 4.588
FERC mitigation power sale agreements  9 Discounted cash flow Forward electricity curves - price per MWh   24.88- 49.78
            
Fair value, by balance sheet grouping [Table Text Block]
  September 30, 2012 December 31, 2011
(in millions) Book Value Fair Value Book Value Fair Value
Progress Energy$ 13,776$ 16,160$ 13,152$ 15,518
PEC  4,838  5,352  4,206  4,735
PEF  4,672  5,646  4,681  5,633
         
PEC [Member]
 
Fair Value Disclosures [Line Items]  
Fair value measurements- assets and liabilities
PEC           
(in millions) Total  Level 1  Level 2  Level 3
September 30, 2012           
Nuclear decommissioning trust fund equity securities$ 797 $ 797 $ - $ -
Nuclear decommissioning trust fund debt securities and other  426   105   321   -
Other long-term available-for-sale debt securities and other(a)  6   6   -   -
 Total assets  1,229   908   321   -
Derivative liabilities(c)  (155)   -   (119)   (36)
 Net assets$ 1,074 $ 908 $ 202 $ (36)
             
(in millions) Total  Level 1  Level 2  Level 3
December 31, 2011           
Nuclear decommissioning trust fund equity securities$ 690 $ 690 $ - $ -
Nuclear decommissioning trust fund debt securities and other  398   81   317   -
Other long-term available-for-sale debt securities and other(a)  6   6   -   -
 Total assets  1,094   777   317   -
Derivative liabilities(c)  (248)   -   (224)   (24)
 Net assets$ 846 $ 777 $ 93 $ (24)
             
(a) Included in Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b) Included in Prepayments and Other Current Assets within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(c) Included in Derivative Liabilities within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets.
             
Fair value, liabilities measured on recurring basis, unobservable input reconciliation
PEC
 Three months ended September 30 Nine months ended September 30
(in millions) 2012  2011  2012  2011
Derivatives, net at beginning of period$ 28 $ 37 $ 24 $ 36
Total pre-tax realized or unrealized gains included in earnings − regulated electric  (2)   -   (2)   -
Total (gains) losses, included in the consolidated Balance Sheet as regulatory asset or liability  (2)   5   2   6
Issuances  16   -   16   -
Settlements  (4)   -   (4)   -
Derivatives, net at end of period$ 36 $ 42 $ 36 $ 42
            
Fair value inputs liabilities quantitative information
            
PEC
(in millions)Fair Value Valuation Technique Unobservable Input  Range
September 30, 2012           
Commodity natural gas hedges$ 27 Discounted cash flow Forward natural gas curves - price per MMBtu $ 4.178- 4.588
FERC mitigation power sale agreements  9 Discounted cash flow Forward electricity curves - price per MWh   24.88- 49.78
            
Fair value, by balance sheet grouping [Table Text Block]
  September 30, 2012 December 31, 2011
(in millions) Book Value Fair Value Book Value Fair Value
Progress Energy$ 13,776$ 16,160$ 13,152$ 15,518
PEC  4,838  5,352  4,206  4,735
PEF  4,672  5,646  4,681  5,633
         
PEF [Member]
 
Fair Value Disclosures [Line Items]  
Fair value measurements- assets and liabilities
PEF           
(in millions) Total  Level 1  Level 2  Level 3
September 30, 2012           
Nuclear decommissioning trust fund equity securities$ 429 $ 423 $ 6 $ -
Nuclear decommissioning trust fund debt securities and other  192   26   166   -
Other long-term available-for-sale debt securities and other(a)  41   2   39   -
Derivative assets(b)  1   -   1   -
 Total assets  663   451   212   -
Derivative liabilities(c)  (276)   -   (276)   -
 Net assets$ 387 $ 451 $ (64) $ -
             
(in millions) Total  Level 1  Level 2  Level 3
December 31, 2011           
Nuclear decommissioning trust fund equity securities$ 372 $ 371 $ 1 $ -
Nuclear decommissioning trust fund debt securities and other  187   6   181   -
Other long-term available-for-sale debt securities and other(a)  1   1   -   -
Derivative assets(b)  5   -   5   -
 Total assets  565   378   187   -
Derivative liabilities(c)  (499)   -   (499)   -
 Net assets$ 66 $ 378 $ (312) $ -
             
(a) Included in Other within Investments and Other Assets in the Balance Sheets.
(b) Included in Prepayments and Other Current Assets within Current Assets and Other within Investments and Other Assets in the Balance Sheets.
(c) Included in Derivative Liabilities within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Balance Sheets.
             
Fair value, by balance sheet grouping [Table Text Block]
  September 30, 2012 December 31, 2011
(in millions) Book Value Fair Value Book Value Fair Value
Progress Energy$ 13,776$ 16,160$ 13,152$ 15,518
PEC  4,838  5,352  4,206  4,735
PEF  4,672  5,646  4,681  5,633