Commitments and Contingencies (Schedule of Expected Insurance Recoveries) (Details) - 2017/2018 Wildfire/Mudslide Event - USD ($) $ in Millions	9 Months Ended	31 Months Ended
Sep. 30, 2020	Jun. 30, 2020
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Ending balance	$ 1,600
Southern California Edison
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Beginning balance	1,710
Insurance recoveries	(73)	$ (363)
Ending balance	$ 1,637

Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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