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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Revenue (Summary of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 3,009	$ 4,269	$ 2,815	$ 2,564	$ 3,220	$ 3,672	$ 2,965	$ 2,463	$ 12,657	$ 12,320	$ 11,869
SCE
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									12,130
Alternative revenue programs and other operating revenue									481
Total operating revenue	2,994	$ 4,260	$ 2,803	$ 2,554	3,193	$ 3,652	$ 2,953	$ 2,456	12,611	12,254	11,830
Receivables from contracts with customers	1,100				825				1,100	825
Accrued unbilled revenues	$ 482				$ 212				482	212
SCE \| Earning Activities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									6,519
Alternative revenue programs and other operating revenue									41
Total operating revenue									6,560	6,611	6,504
SCE \| Cost- Recovery Activities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers									5,611
Alternative revenue programs and other operating revenue									440
Total operating revenue									$ 6,051	$ 5,643	$ 5,326