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Commitments and Contingencies (Contingencies) (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended
Dec. 31, 2011
Jun. 30, 2010
Sep. 30, 2012
Sep. 30, 2012
sites
Sep. 30, 2011
Sep. 15, 2012
Oct. 31, 2011
Malibu Fire Order Instituting Investigation
Oct. 31, 2011
Alleged violations of PSD requirements and New Source Performance Standards of the CAA
private_environmental_organization
Sep. 30, 2012
Insurance Claims
Sep. 30, 2012
San Onofre
generator
Mar. 31, 2012
San Onofre
heat_transfer_tube
Sep. 30, 2012
San Onofre
Outage, Inspection and Repair Issues
H
Sep. 30, 2012
San Onofre and Palo Verde
Insurance Claims
Oct. 31, 2011
OII Respondents
Malibu Fire Order Instituting Investigation
Contingencies                            
Number of steam generators replaced (in generators)                   4        
Heat transfer tubes with water leak (in heat transfer tubes)                     1      
Reduced power level of operation (as a percentage)                       70.00%    
Term of reduced power level of operation (in months)                       5 months    
Authorized expenditures                       $ 525,000,000    
Authorized expenditures, after adjustments for inflation                       665,000,000    
Ownership percentage (as a percentage)                   78.21%        
Costs incurred to date                       594,000,000    
Construction work in progress                       95,000,000    
Authorized expenditures by authoritative body, market costs incurred                       221,000,000    
Incremental inspection and repair costs                       96,000,000    
Collected revenue, based on current authorized revenue requirements                       625,000,000    
Annual revenue requirement request                       820,000,000    
Annual revenue requirement request, nuclear fuel-related and decommissioning costs                       170,000,000    
Direct operating and maintenance costs, depreciation and return on investment                       650,000,000    
Rate base                       1,200,000,000    
Net investment and inventory associated with plant                       2,100,000,000    
Term of outage for which notification is required (in months)                       9 months    
Required term, from notice of investigation to remove revenue requirements from customer rates                       45 days    
Continuous hours of operation, after which rates may be readjusted (in hours)                       100    
Warranty period                       20 years    
MHI's limited liability under purchase agreement, excluding consequential damages                       138,000,000    
Invoiced amount to MHI                       45,000,000    
Damages sought 98,000,000           50,000,000             99,000,000
Number of plantiffs               4            
Maximum expected period for cleanup of identified sites (in years)     30 years                      
Accrued liability for environmental remediation     113,000,000 113,000,000           78,000,000        
Identified material sites for environmental remediation (in number of sites)       25                    
Identified material sites, minimum amount of upper end of range of costs       1,000,000                    
Number of Immaterial Sites for Environmental Remediation       33                    
Immaterial sites, range of liability, minimum     3,000,000 3,000,000                    
Environmental remediation liability     116,000,000 116,000,000                    
Environmental remediation liability, recorded as regulatory asset     113,000,000 113,000,000                    
Portion of Recorded Liability Recoverable From Incentive Mechanism       31,000,000                    
Percentage of Environmental Remediation Costs Recoverable From Incentive Mechanism       90.00%                    
Recorded Liability Incurred at Majority of Remaining Sites Through Customer Rates     82,000,000 82,000,000                    
Percentage of Environmental Remediation Costs to be Recovered       100.00%                    
Amount that Cleanup Costs for Identified Material Sites Could Exceed Recorded Liability       185,000,000                    
Amount that Cleanup Costs for Immaterial Sites Could Exceed Recorded Liability       6,000,000                    
Expected Annual Environmental Remediation Costs, Low End of Range       7,000,000                    
Expected Annual Environmental Remediation Costs, High End of Range       14,000,000                    
Environmental Remediation Expense       5,000,000 9,000,000                  
Federal Limit on Public Liability Claims from Nuclear Incident, Approximate                 12,600,000,000          
Private Primary Insurance Purchased                 375,000,000          
Maximum Deferred Insurance Premium Per Nuclear Incident                 235,000,000          
Maximum Yearly Assessment Per Nuclear Incident                 35,000,000          
Loss Limit, Property Damage Insurance                         500,000,000  
Loss Limit, Property Damage Insurance, Federal Minimum Requirement                         1,100,000,000  
Limit on Assessment of Retrospective Premium Adjustments, Per Year, Approximate                 49,000,000          
Insurance Coverage for Wildfire Liabilities Limit           550,000,000                
Self Insurance Retention Per Wildfire Occurence           10,000,000                
Amount Of Damages Decision By US Court Of Federal Claims Spent Nuclear Fuel Litigation   $ 142,000,000