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Preferred Stock of Subsidiaries (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Disclosure Preferred Stock Of Subsidiaries Details [Abstract]    
Preferred stock liquidation preference per share $ 100  
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 7.10%  
Total $ 93 $ 93
PEC
   
Preferred Stock Outstanding [Line Items]    
Total 59 59
PEC | Preference Stock
   
Preferred Stock Outstanding [Line Items]    
Shares authorized 10,000,000 10,000,000
PEC | Cumulative | $5 Preferred Stock
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend per share amount $ 5.00 $ 5.00
Shares authorized 300,000 300,000
Share outstanding 236,997 236,997
Redemption price $ 110.00 $ 110.00
Total 24 24
PEC | Cumulative | Serial Preferred Stock
   
Preferred Stock Outstanding [Line Items]    
Shares authorized 20,000,000 20,000,000
PEC | Cumulative | Serial Preferred Stock | $4.20 Serial Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend per share amount $ 4.20 $ 4.20
Share outstanding 100,000 100,000
Redemption price $ 102.00 $ 102.00
Total 10 10
PEC | Cumulative | Serial Preferred Stock | $5.44 Serial Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend per share amount $ 5.44 $ 5.44
Share outstanding 249,850 249,850
Redemption price $ 101.00 $ 101.00
Total 25 25
PEC | Cumulative | Preferred Stock A
   
Preferred Stock Outstanding [Line Items]    
Shares authorized 5,000,000 5,000,000
PEF
   
Preferred Stock Outstanding [Line Items]    
Total 34 34
PEF | Preference Stock
   
Preferred Stock Outstanding [Line Items]    
Par Value $ 100 $ 100
Shares authorized 1,000,000 1,000,000
PEF | Cumulative | Preferred Stock A
   
Preferred Stock Outstanding [Line Items]    
Shares authorized 5,000,000 5,000,000
PEF | Cumulative | Preferred Stock
   
Preferred Stock Outstanding [Line Items]    
Par Value $ 100 $ 100
Shares authorized 4,000,000 4,000,000
PEF | Cumulative | Preferred Stock | 4.00% $100 par value Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 4.00% 4.00%
Par Value $ 100 $ 100
Share outstanding 39,980 39,980
Redemption price $ 104.25 $ 104.25
Total 4 4
PEF | Cumulative | Preferred Stock | 4.40% $100 par value Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 4.40% 4.40%
Par Value $ 100 $ 100
Share outstanding 75,000 75,000
Redemption price $ 102.00 $ 102.00
Total 8 8
PEF | Cumulative | Preferred Stock | 4.58% $100 par value Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 4.58% 4.58%
Par Value $ 100 $ 100
Share outstanding 99,990 99,990
Redemption price $ 101.00 $ 101.00
Total 10 10
PEF | Cumulative | Preferred Stock | 4.60% $100 par value Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 4.60% 4.60%
Par Value $ 100 $ 100
Share outstanding 39,997 39,997
Redemption price $ 103.25 $ 103.25
Total 4 4
PEF | Cumulative | Preferred Stock | 4.75% $100 par value Preferred
   
Preferred Stock Outstanding [Line Items]    
Preferred stock dividend rate percentage 4.75% 4.75%
Par Value $ 100 $ 100
Share outstanding 80,000 80,000
Redemption price $ 102.00 $ 102.00
Total $ 8 $ 8