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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Oct. 31, 2012
Southern California Edison
Subsequent Event
Sep. 30, 2012
Homer City
Sep. 30, 2012
IRS Examination
Sep. 30, 2012
IRS Examination
Southern California Edison
Effective Tax Rate                  
Income from continuing operations before income taxes $ 477,000,000 $ 658,000,000 $ 781,000,000 $ 1,218,000,000          
Provision for income tax at federal statutory rate of 35% 167,000,000 230,000,000 273,000,000 426,000,000          
Increase (decrease) in income tax from:                  
State tax benefit - net of federal benefit 60,000,000 28,000,000 56,000,000 40,000,000          
Production and housing credits (12,000,000) (12,000,000) (48,000,000) (48,000,000)          
Property-related (20,000,000) (18,000,000) (39,000,000) (38,000,000)          
Other (14,000,000) 4,000,000 (25,000,000) (10,000,000)          
Total income tax expense from continuing operations 181,000,000 232,000,000 217,000,000 370,000,000          
Effective tax rate 38.00% 35.00% 28.00% 30.00%          
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%          
Reconciliation of Unrecognized Tax Benefits                  
Beginning balance     631,000,000 565,000,000          
Tax positions taken during the current year, Increases     22,000,000 53,000,000          
Tax positions taken during a prior year, Increases     207,000,000 60,000,000          
Tax positions taken during a prior year, Decreases     (29,000,000) (37,000,000)          
Decreases for settlements during the period     0 0          
Ending balance 831,000,000 641,000,000 831,000,000 641,000,000          
Unrecognized tax benefits that would impact the effective tax rate 578,000,000   578,000,000   532,000,000        
Settlement of Tax Disputes                  
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment               198,000,000 95,000,000
Penalty for understatement of tax liability (as a percent)               40.00%  
Tax Election at Homer City                  
Tax reduction due to change in tax treatment of entity             1,000,000,000    
Federal and state net operating loss carryforwards and federal tax credit carryfowards             1,600,000,000    
Potential earnings benefit attributable to flow through treatment of vintage year activity           $ 230,000,000