Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets at fair value
Nuclear decommissioning trusts	$ 4,479	$ 4,120
Southern California Edison
Assets at fair value
Nuclear decommissioning trusts	$ 4,479	$ 4,120
Liabilities at fair value
Percentage of equity investments located in the United States	72.00%	71.00%
Collateralized mortgage obligations and other asset backed securities	$ 64	$ 67
Payables, net, related to investments	137	143
Southern California Edison \| Fair Value, Measurements, Recurring
Assets at fair value
Netting and Collateral	(16)	0
Derivative contracts, net	64	173
Money market fund and other	64	30
Nuclear decommissioning trusts	4,616	4,263
Total assets	4,744	4,466
Liabilities at fair value
Netting and Collateral	(24)	(7)
Derivative contracts	0	6
Total liabilities	0	6
Total assets, netting and collateral	8	7
Net assets	4,744	4,460
Southern California Edison \| Fair Value, Measurements, Recurring \| Stocks
Assets at fair value
Nuclear decommissioning trusts	1,619	1,382
Southern California Edison \| Fair Value, Measurements, Recurring \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	2,840	2,666
Southern California Edison \| Fair Value, Measurements, Recurring \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	157	215
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 1
Assets at fair value
Derivative contracts	0	0
Money market fund and other	50	9
Nuclear decommissioning trusts	2,599	2,503
Total assets	2,649	2,512
Liabilities at fair value
Derivative contracts	0	0
Total liabilities	0	0
Net assets	2,649	2,512
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 1 \| Stocks
Assets at fair value
Nuclear decommissioning trusts	1,619	1,382
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 1 \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	873	1,001
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 1 \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	107	120
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 2
Assets at fair value
Derivative contracts	10	32
Money market fund and other	14	21
Nuclear decommissioning trusts	2,017	1,760
Total assets	2,041	1,813
Liabilities at fair value
Derivative contracts	17	13
Total liabilities	17	13
Net assets	2,024	1,800
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 2 \| Stocks
Assets at fair value
Nuclear decommissioning trusts	0	0
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 2 \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	1,967	1,665
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 2 \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	50	95
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 3
Assets at fair value
Derivative contracts	70	141
Money market fund and other	0	0
Nuclear decommissioning trusts	0	0
Total assets	70	141
Liabilities at fair value
Derivative contracts	7	0
Total liabilities	7	0
Net assets	63	141
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 3 \| Stocks
Assets at fair value
Nuclear decommissioning trusts	0	0
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 3 \| Fixed Income
Assets at fair value
Nuclear decommissioning trusts	0	0
Southern California Edison \| Fair Value, Measurements, Recurring \| Level 3 \| Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	$ 0	$ 0

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This element represents the percentage of equity investments located in United States.

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Interest and dividends receivables and receivables related to pending securities sales and payables related to pending securities purchases as of the balance sheet date.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements.

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Fair value of asset after deduction of liability.

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Fair value of financial and nonfinancial obligations.

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Fair value portion of other assets.

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