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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) (Postretirement Benefits Other Than Pensions, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net Fair Value of Plan Assets $ 1,800 $ 1,570 $ 1,606
Target asset allocation percentage of US equity securities 41.00% 41.00%  
Private bond
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target asset allocation percentage of US equity securities 6.00% 6.00%  
Undervalued Securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target asset allocation percentage of US equity securities 6.00% 6.00%  
Collateralized mortgage obligations and other asset backed securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Receivables and payables, net 20 14  
Municipal Notes
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 73 60  
Russell 200 and Russell 1000 indexes | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark 50.00% 53.00%  
Russell 1000 index | Common or collective equity funds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark 60.00% 63.00%  
Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark 23.00% 21.00%  
MSCI All Country World Index | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark 50.00% 47.00%  
Level 3
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net Fair Value of Plan Assets 166 130 92
Level 3 | Asset backed securities including distressed mortgages
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 82.00% 81.00%  
Southern California Edison
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 1,841 1,593  
Receivables and payables, net (41) (23)  
Net Fair Value of Plan Assets 1,800 1,570 1,606
Southern California Edison | Common/collective funds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 723 [1] 642 [1]  
Southern California Edison | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 361 [2] 319 [2]  
Southern California Edison | Corporate notes and bonds securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 210 [3] 177 [3]  
Southern California Edison | Partnerships/joint ventures
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 183 [4] 146 [4]  
Southern California Edison | U.S. government and agency securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 162 [5] 142 [5]  
Southern California Edison | Registered investment companies
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 68 [6] 80 [6]  
Southern California Edison | Interest-bearing cash
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 24 12  
Southern California Edison | Other
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 110 [7] 75 [7]  
Southern California Edison | Level 1
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 590 515  
Southern California Edison | Level 1 | Common/collective funds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [1] 0 [1]  
Southern California Edison | Level 1 | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 361 [2] 319 [2]  
Southern California Edison | Level 1 | Corporate notes and bonds securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [3] 0 [3]  
Southern California Edison | Level 1 | Partnerships/joint ventures
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [4] 0 [4]  
Southern California Edison | Level 1 | U.S. government and agency securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 131 [5] 100 [5]  
Southern California Edison | Level 1 | Registered investment companies
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 68 [6] 80 [6]  
Southern California Edison | Level 1 | Interest-bearing cash
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 24 12  
Southern California Edison | Level 1 | Other
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 6 [7] 4 [7]  
Southern California Edison | Level 2
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 1,085 948  
Southern California Edison | Level 2 | Common/collective funds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 723 [1] 642 [1]  
Southern California Edison | Level 2 | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [2] 0 [2]  
Southern California Edison | Level 2 | Corporate notes and bonds securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 210 [3] 177 [3]  
Southern California Edison | Level 2 | Partnerships/joint ventures
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 17 [4] 16 [4]  
Southern California Edison | Level 2 | U.S. government and agency securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 31 [5] 42 [5]  
Southern California Edison | Level 2 | Registered investment companies
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [6] 0 [6]  
Southern California Edison | Level 2 | Interest-bearing cash
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 0  
Southern California Edison | Level 2 | Other
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 104 [7] 71 [7]  
Southern California Edison | Level 3
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 166 130  
Southern California Edison | Level 3 | Common/collective funds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [1] 0 [1]  
Southern California Edison | Level 3 | Corporate stocks
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [2] 0 [2]  
Southern California Edison | Level 3 | Corporate notes and bonds securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [3] 0 [3]  
Southern California Edison | Level 3 | Partnerships/joint ventures
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 166 [4] 130 [4]  
Southern California Edison | Level 3 | U.S. government and agency securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [5] 0 [5]  
Southern California Edison | Level 3 | Registered investment companies
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 [6] 0 [6]  
Southern California Edison | Level 3 | Interest-bearing cash
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross 0 0  
Southern California Edison | Level 3 | Other
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair Value of Plan Assets, Gross $ 0 [7] $ 0 [7]  
[1] At December 31, 2012 and 2011, respectively, 60% and 63% of the common/collective assets are invested in a large cap index fund which seeks to track performance of the Russell 1000 index. 23% and 21% of the assets in this category are in index funds which seek to track performance in the MSCI Europe, Australasia and Far East (EAFE) Index. 6% and 6% of this category are invested in a privately managed bond fund and 6% and 6% in a fund which invests in equity securities the fund manager believes are undervalue
[2] Corporate stock performance is primarily benchmarked against the Russell Indexes (50% and 53%) and the MSCI All Country World (ACWI) index (50% and 47%) for 2012 and 2011, respectivel
[3] Corporate notes and bonds are diversified and include approximately $20 million and $14 million for commercial collateralized mortgage obligations and other asset backed securities at December 31, 2012 and 2011, respectively.
[4] At December 31, 2012 and 2011, respectively, 82% and 81% of the Level 3 partnerships category is invested in (1) asset backed securities including distressed mortgages, (2) distressed companies and (3) commercial and residential loans and debt and equity of banks.
[5] Level 1 U.S. government and agency securities are U.S. treasury bonds and notes. Level 2 primarily relates to the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association.
[6] Level 1 registered investment companies consist of an investment grade corporate bond mutual fund and a money market fund.
[7] Other includes $73 million and $60 million of municipal securities at December 31, 2012 and 2011, respectively.