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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 812 | $ 631 | $ 565
Tax positions taken during the current year, Increases | 19 | 33 | 39
Tax positions taken during a prior year, Increases | 43 | 177 | 102
Tax positions taken during a prior year, Decreases | (109) | (11) | (75)
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME | 50 | (18) | 0
Decreases for settlements during the period | 0 | 0 | 0
Ending balance | 815 | 812 | 631
Southern California Edison |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 571 | 373 | 329
Tax positions taken during the current year, Increases | 22 | 35 | 34
Tax positions taken during a prior year, Increases | 45 | 169 | 82
Tax positions taken during a prior year, Decreases | (106) | (6) | (72)
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME | 0 | 0 | 0
Decreases for settlements during the period | 0 | 0 | 0
Ending balance | $ 532 | $ 571 | $ 373

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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