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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 613 | $ 679 | $ 370
Tax positions taken during the current year, Increases | 54 | 53 | 55
Tax positions taken during a prior year, Increases |  | 3 | 274
Tax positions taken during a prior year, decreases | (21) | (118) | (20)
Settlements with taxing authorities |  | (4) |
Ending balance | 646 | 613 | 679
Unrecognized tax benefits that would impact the effective tax rate |  | 341 |
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 340 | 320 | 282
Tax positions taken during the current year, Increases | 54 | 53 | 56
Tax positions taken during a prior year, Increases |  | 1 | 4
Tax positions taken during a prior year, decreases | (20) | (29) | (22)
Settlements with taxing authorities |  | (5) |
Ending balance | $ 374 | 340 | $ 320
Unrecognized tax benefits that would impact the effective tax rate |  | $ 69 |

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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 https://asc.fasb.org/extlink&oid=123427490&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 https://asc.fasb.org/extlink&oid=121826272&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 https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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