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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Revenue (Deferred) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Revenue (Deferred) (Details) - USD ($) $ in Millions	Jul. 31, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Revenue
Proceeds from Morongo Transmission LLC			$ 400
SCE
Revenue
Proceeds from Morongo Transmission LLC			400	$ 0
SCE \| West of Devers
Revenue
Proceeds from Morongo Transmission LLC	$ 400
Annual revenue to be recognized	$ 13
Deferred revenue balance		$ 398	398
Deferred revenue current		13	13
Deferred revenue non-current		385	$ 385
Revenue recognized		$ 2
SCE \| West of Devers \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue
Revenue recognition period	30 years