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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | $ 471 | $ 529 | $ 576
Tax positions taken during the current year, Increases | 51 | 36 | 54
Tax positions taken during a prior year, Increases | 0 | 2 | 66
Tax positions taken during a prior year, Decreases | (7) | (96) | (165)
Tax positions taken during a prior year, Decreases for settlements during the period | (83) | 0 | (2)
Balance at December 31, | 432 | 471 | 529
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | 371 | 353 | 441
Tax positions taken during the current year, Increases | 51 | 36 | 48
Tax positions taken during a prior year, Increases | 0 | 0 | 23
Tax positions taken during a prior year, Decreases | (13) | (18) | (159)
Tax positions taken during a prior year, Decreases for settlements during the period | (78) | 0 | 0
Balance at December 31, | $ 331 | $ 371 | $ 353

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + 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) -URI http://asc.fasb.org/extlink&oid=84230637&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=84230637&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=84230637&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=84230637&loc=SL6600010-109319 + Details
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