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Other Investments (Textual) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other Investments [Line Items] |  |  |
Proceeds from sale of securities | $ 2,122,000,000 | $ 2,773,000,000 | $ 1,432,000,000
Sale of lease investment | 108,000,000 |  |
Southern California Edison |  |  |
Other Investments [Line Items] |  |  |
Contributions received for decommissioning trusts | 23,000,000 |  |
Period of reviewing contributions from decommissioning trusts (in years) | 3 years |  |
Proceeds from sale of securities | 2,122,000,000 | 2,773,000,000 | 1,432,000,000
Unrealized holding gains, net of losses | 1,600,000,000 | 1,300,000,000 |
Beaver Valley Nuclear Plant |  |  |
Other Investments [Line Items] |  |  |
Gain (loss) on sale of leases, before tax | 65,000,000 |  |
Gain (loss) on sale of leases, after tax | 31,000,000 |  |
American Airlines Lease |  |  |
Other Investments [Line Items] |  |  |
Lease impairment charge, before tax |  | 26,000,000 |
Lease impairment charge, after tax |  | $ 16,000,000 |

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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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