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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | $ 370 | $ 338 | $ 432
Tax positions taken during the current year, Increases | 55 | 46 | 41
Tax positions taken during a prior year, Increases | 274 | 6 | 0
Tax positions taken during a prior year, Decreases | (20) | (20) | (108)
Tax positions taken during a prior year, Decreases for settlements during the period | 0 | 0 | (27)
Balance at December 31, | 679 | 370 | 338
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | 282 | 249 | 331
Tax positions taken during the current year, Increases | 56 | 47 | 42
Tax positions taken during a prior year, Increases | 4 | 6 | 0
Tax positions taken during a prior year, Decreases | (22) | (20) | (121)
Tax positions taken during a prior year, Decreases for settlements during the period | 0 | 0 | (3)
Balance at December 31, | $ 320 | $ 282 | $ 249

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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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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/disclosureRef -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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