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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | $ 679 | $ 370 | $ 338
Tax positions taken during the current year, Increases | 53 | 55 | 46
Tax positions taken during a prior year, Increases | 3 | 274 | 6
Tax positions taken during a prior year, decreases | (118) | (20) | (20)
Settlements with taxing authorities | (4) |  |
Ending balance | 613 | 679 | 370
Unrecognized tax benefits that would impact the effective tax rate | 344 |  |
SCE |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |
Beginning balance | 320 | 282 | 249
Tax positions taken during the current year, Increases | 53 | 56 | 47
Tax positions taken during a prior year, Increases | 1 | 4 | 6
Tax positions taken during a prior year, decreases | (29) | (22) | (20)
Settlements with taxing authorities | (5) |  |
Ending balance | 340 | $ 320 | $ 282
Unrecognized tax benefits that would impact the effective tax rate | $ 71 |  |

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