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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 646 | $ 613 | $ 679
Tax positions taken during the current year, Increases | 65 | 54 | 53
Tax positions taken during a prior year, Increases | 13 |  | 3
Tax positions taken during a prior year, decreases | (294) | (21) | (118)
Settlements with taxing authorities |  |  | (4)
Ending balance | 430 | 646 | 613
Unrecognized tax benefits that would impact the effective tax rate | 80 |  |
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 374 | 340 | 320
Tax positions taken during the current year, Increases | 65 | 54 | 53
Tax positions taken during a prior year, Increases | 4 |  | 1
Tax positions taken during a prior year, decreases | (25) | (20) | (29)
Settlements with taxing authorities |  |  | (5)
Ending balance | 418 | $ 374 | $ 340
Unrecognized tax benefits that would impact the effective tax rate | $ 68 |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + 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/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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