Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) (Postretirement Benefits Other Than Pensions, USD $) In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Net Fair Value of Plan Assets |
$ 1,800 |
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$ 1,570 |
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$ 1,606 |
Target asset allocation percentage of US equity securities |
41.00% |
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41.00% |
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Private bond
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Target asset allocation percentage of US equity securities |
6.00% |
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6.00% |
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Undervalued Securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Target asset allocation percentage of US equity securities |
6.00% |
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6.00% |
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Collateralized mortgage obligations and other asset backed securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Receivables and payables, net |
20 |
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14 |
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Municipal Notes
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
73 |
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60 |
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Russell 200 and Russell 1000 indexes | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Performance percentage benchmark |
50.00% |
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53.00% |
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Russell 1000 index | Common or collective equity funds
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Performance percentage benchmark |
60.00% |
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63.00% |
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Morgan Stanley Capital International Europe Australasia And Far East Index | Equity index fund
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Performance percentage benchmark |
23.00% |
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21.00% |
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MSCI All Country World Index | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Performance percentage benchmark |
50.00% |
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47.00% |
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Level 3
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Net Fair Value of Plan Assets |
166 |
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130 |
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92 |
Level 3 | Asset backed securities including distressed mortgages
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Actual plan asset allocations |
82.00% |
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81.00% |
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Southern California Edison
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
1,841 |
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1,593 |
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Receivables and payables, net |
(41) |
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(23) |
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Net Fair Value of Plan Assets |
1,800 |
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1,570 |
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1,606 |
Southern California Edison | Common/collective funds
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
723 |
[1] |
642 |
[1] |
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Southern California Edison | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
361 |
[2] |
319 |
[2] |
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Southern California Edison | Corporate notes and bonds securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
210 |
[3] |
177 |
[3] |
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Southern California Edison | Partnerships/joint ventures
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
183 |
[4] |
146 |
[4] |
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Southern California Edison | U.S. government and agency securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
162 |
[5] |
142 |
[5] |
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Southern California Edison | Registered investment companies
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
68 |
[6] |
80 |
[6] |
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Southern California Edison | Interest-bearing cash
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
24 |
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12 |
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Southern California Edison | Other
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
110 |
[7] |
75 |
[7] |
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Southern California Edison | Level 1
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
590 |
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515 |
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Southern California Edison | Level 1 | Common/collective funds
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[1] |
0 |
[1] |
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Southern California Edison | Level 1 | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
361 |
[2] |
319 |
[2] |
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Southern California Edison | Level 1 | Corporate notes and bonds securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[3] |
0 |
[3] |
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Southern California Edison | Level 1 | Partnerships/joint ventures
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[4] |
0 |
[4] |
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Southern California Edison | Level 1 | U.S. government and agency securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
131 |
[5] |
100 |
[5] |
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Southern California Edison | Level 1 | Registered investment companies
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
68 |
[6] |
80 |
[6] |
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Southern California Edison | Level 1 | Interest-bearing cash
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
24 |
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12 |
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Southern California Edison | Level 1 | Other
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
6 |
[7] |
4 |
[7] |
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Southern California Edison | Level 2
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
1,085 |
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948 |
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Southern California Edison | Level 2 | Common/collective funds
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
723 |
[1] |
642 |
[1] |
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Southern California Edison | Level 2 | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[2] |
0 |
[2] |
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Southern California Edison | Level 2 | Corporate notes and bonds securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
210 |
[3] |
177 |
[3] |
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Southern California Edison | Level 2 | Partnerships/joint ventures
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
17 |
[4] |
16 |
[4] |
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Southern California Edison | Level 2 | U.S. government and agency securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
31 |
[5] |
42 |
[5] |
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Southern California Edison | Level 2 | Registered investment companies
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[6] |
0 |
[6] |
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Southern California Edison | Level 2 | Interest-bearing cash
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
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0 |
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Southern California Edison | Level 2 | Other
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
104 |
[7] |
71 |
[7] |
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Southern California Edison | Level 3
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
166 |
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130 |
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Southern California Edison | Level 3 | Common/collective funds
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[1] |
0 |
[1] |
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Southern California Edison | Level 3 | Corporate stocks
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[2] |
0 |
[2] |
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Southern California Edison | Level 3 | Corporate notes and bonds securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[3] |
0 |
[3] |
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Southern California Edison | Level 3 | Partnerships/joint ventures
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
166 |
[4] |
130 |
[4] |
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Southern California Edison | Level 3 | U.S. government and agency securities
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[5] |
0 |
[5] |
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Southern California Edison | Level 3 | Registered investment companies
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
[6] |
0 |
[6] |
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Southern California Edison | Level 3 | Interest-bearing cash
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
0 |
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0 |
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Southern California Edison | Level 3 | Other
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
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Fair Value of Plan Assets, Gross |
$ 0 |
[7] |
$ 0 |
[7] |
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