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Summary of Significant Accounting Policies (Changes in Allowance for Uncollectible Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 75 | $ 35
Included in operation and maintenance expenses | 11 | 39
Deferred to regulatory assets | 43 | 64
Less: write-offs, net of recoveries | 5 | 14
Ending balance | 124 | 124
All others |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 15 | 14
Included in operation and maintenance expenses | 4 | 11
Deferred to regulatory assets | 0 | 0
Less: write-offs, net of recoveries | 2 | 8
Ending balance | $ 17 | $ 17

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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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