Derivative Instruments and Hedging Activities (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	$ 122	$ 129
Long-Term, Derivative Assets	251	85
Short-Term, Derivative Liabilities	152	126
Long-Term, Derivative Liabilities	1,042	939
Southern California Edison
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	122	129
Long-Term, Derivative Assets	251	85
Short-Term, Derivative Liabilities	152	126
Long-Term, Derivative Liabilities	1,042	939
Southern California Edison \| Electric Utility
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	122	129
Long-Term, Derivative Assets	251	85
Derivative Assets, Total	373	214
Short-Term, Derivative Liabilities	152	126
Long-Term, Derivative Liabilities	1,042	939
Derivative Liabilities, Total	1,194	1,065
Net Liability	821	851
Fair value of derivative liabilities	1,194	1,065
Southern California Edison \| Electric Utility \| Economic hedges
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	141	151
Long-Term, Derivative Assets	251	91
Derivative Assets, Total	392	242
Short-Term, Derivative Liabilities	178	186
Long-Term, Derivative Liabilities	1,045	954
Derivative Liabilities, Total	1,223	1,140
Net Liability	831	898
Fair value of derivative liabilities	1,223	1,140
Southern California Edison \| Electric Utility \| Netting and Collateral
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	(19)	(22)
Long-Term, Derivative Assets	0	(6)
Derivative Assets, Total	(19)	(28)
Short-Term, Derivative Liabilities	(19)	(22)
Long-Term, Derivative Liabilities	0	(6)
Derivative Liabilities, Total	(19)	(28)
Net Liability	0	0
Fair value of derivative liabilities	(19)	(28)
Southern California Edison \| Electric Utility \| Cash collateral posted
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	0	0
Long-Term, Derivative Assets	0	0
Derivative Assets, Total	0	0
Short-Term, Derivative Liabilities	(7)	(38)
Long-Term, Derivative Liabilities	(3)	(9)
Derivative Liabilities, Total	(10)	(47)
Net Liability	(10)	(47)
Fair value of derivative liabilities	$ (10)	$ (47)

Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the 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 assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details