Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		$ 72.2		$ 70.0		$ 126.1
Charged to Costs and Expenses		46.9		43.8		55.3
Charged to Other Accounts		0.0		0.0		0.0
Deductions	[1]	47.8		41.6		111.4
Balance at End of Period		71.3		72.2		70.0
Deferred tax assets, loss and credit carryforwards		1,388.0		1,657.0		2,200.0
Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		48.9		52.2		46.6
Charged to Costs and Expenses		23.9		24.1		36.0
Charged to Other Accounts		0.0		0.0		0.0
Deductions		26.6		27.4		30.4
Balance at End of Period		46.2		48.9		52.2
All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		23.3		17.8		79.5
Charged to Costs and Expenses		23.0		19.7		19.3
Charged to Other Accounts		0.0		0.0		0.0
Deductions		21.2		14.2		81.0
Balance at End of Period		25.1		23.3		17.8
Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		29.0	[2]	1,380.0	[2]	1,016.5
Charged to Costs and Expenses		3.0		0.0	[2]	363.5	[2]
Charged to Other Accounts		0.0		0.0		0.0
Deductions		0.0		1,351.0	[3]	0.0
Balance at End of Period		32.0		29.0	[2]	1,380.0	[2]
Edison Mission Energy
Movement in Valuation and Qualifying Accounts
Deferred tax assets, loss and credit carryforwards						1,600.0
Deferred income tax benefits, net						220.0
Southern California Edison
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		67.6		65.5		74.9
Charged to Costs and Expenses		41.9		43.7		55.3
Charged to Other Accounts		0.0		0.0		0.0
Deductions	[4]	47.8		41.6		64.7
Balance at End of Period		61.7		67.6		65.5
Deferred tax assets, loss and credit carryforwards		0.0		205.0
Southern California Edison | Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		48.9		52.2		46.6
Charged to Costs and Expenses		23.9		24.1		36.0
Charged to Other Accounts		0.0		0.0		0.0
Deductions		26.6		27.4		30.4
Balance at End of Period		46.2		48.9		52.2
Southern California Edison | All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		18.7		13.3		28.3
Charged to Costs and Expenses		18.0		19.6		19.3
Charged to Other Accounts		0.0		0.0		0.0
Deductions		21.2		14.2		34.3
Balance at End of Period		$ 15.5		$ 18.7		$ 13.3

[1] Accounts written off, net.

[2] Edison International recorded deferred tax assets of $2.2 billion related to net operating losses and tax carryforwards that pertain to Edison International's consolidated or combined federal and state tax returns, including approximately $1.6 billion related to EME. Edison International continues to consolidate EME for federal and certain combined state tax returns. EME's Plan of Reorganization, filed in December 2013 ("December Plan of Reorganization"), provides for the transfer of EIX's ownership interest to the creditors, which would result in a tax deconsolidation of EME. Under federal and state tax regulations, the tax deconsolidation of EME would reduce the amounts of net operating loss and tax credits carryforwards that Edison International would be eligible to use in future periods. As a result of the EME's December Plan of Reorganization, which would result in a tax deconsolidation of EME, Edison International has recorded a $1.380 billion valuation allowance based on the estimated amount of such benefits as calculated under the applicable federal and state tax regulations as of December 31, 2013. The deferred income tax benefits recognized by Edison International less the valuation allowance for amounts that would no longer be available upon tax deconsolidation of EME was approximately $220 million.

[3] On April 1, 2014, under the Amended Plan of Reorganization, EME emerged from bankruptcy free of liabilities but remained an indirect wholly-owned subsidiary of Edison International, which will continue to be consolidated with Edison International for income tax purposes. Edison International anticipates realization of the federal and California tax benefits before they expire. Therefore, the valuation allowance on federal and California tax benefits that Edison International recorded in 2013 was released in 2014. The remaining valuation allowance is related to non California state tax benefits.

[4] Accounts written off, net.