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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | $ 432 | $ 471 | $ 529
Tax positions taken during the current year, Increases | 41 | 51 | 36
Tax positions taken during a prior year, Increases | 0 | 0 | 2
Tax positions taken during a prior year, Decreases | (108) | (7) | (96)
Tax positions taken during a prior year, Decreases for settlements during the period | (27) | (83) | 0
Balance at December 31, | 338 | 432 | 471
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | 331 | 371 | 353
Tax positions taken during the current year, Increases | 42 | 51 | 36
Tax positions taken during a prior year, Increases | 0 | 0 | 0
Tax positions taken during a prior year, Decreases | (121) | (13) | (18)
Tax positions taken during a prior year, Decreases for settlements during the period | (3) | (78) | 0
Balance at December 31, | $ 249 | $ 331 | $ 371

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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