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Regulatory Assets, Liabilities, And Balancing Accounts (Current Regulatory Balancing Accounts, Net) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net $ 784 $ 708
Utility Generation [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net 412 241
Distribution Revenue Adjustment Mechanism [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net 422 223
Public Purpose Programs [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net 96 97
Hazardous Substance [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net 56 57
Gas Fixed Cost [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net (101) 16
Energy Procurement [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net (129) (48)
Other Current Balancing Accounts [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net 136 227
Energy Recovery Bonds [Member]
   
Regulatory Assets [Line Items]    
Total regulatory balancing accounts, net $ (108) $ (105)