Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		$ 53.9	$ 61.8	$ 61.7
Charged to Costs and Expenses		35.2	26.4	33.6
Charged to Other Accounts		0.0	0.0	0.0
Deductions		37.6	34.3	33.5
Balance at End of Period		51.5	53.9	61.8
Recorded valuation allowance		32.0
Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		36.6	41.2	46.2
Charged to Costs and Expenses		19.0	12.9	17.7
Charged to Other Accounts		0.0	0.0	0.0
Deductions		23.6	17.5	22.7
Balance at End of Period		32.0	36.6	41.2
All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		17.3	20.6	15.5
Charged to Costs and Expenses		16.2	13.5	15.9
Charged to Other Accounts		0.0	0.0	0.0
Deductions		14.0	16.8	10.8
Balance at End of Period		19.5	17.3	20.6
Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		28.0	24.0	32.0
Charged to Costs and Expenses		0.0	0.0	0.0
Charged to Other Accounts		8.0	4.0	0.0
Deductions		0.0	0.0	8.0
Balance at End of Period		36.0	28.0	24.0
Allowances and reserves written off				8.0
Southern California Edison Company
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		53.3	61.1	61.7
Charged to Costs and Expenses		35.1	26.4	32.9
Charged to Other Accounts		0.0	0.0	0.0
Deductions		37.3	34.2	33.5
Balance at End of Period		51.1	53.3	61.1
Southern California Edison Company | Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		36.0	40.5	46.2
Charged to Costs and Expenses		18.9	12.9	17.0
Charged to Other Accounts		0.0	0.0	0.0
Deductions		23.3	17.4	22.7
Balance at End of Period		31.6	36.0	40.5
Southern California Edison Company | All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period		17.3	20.6	15.5
Charged to Costs and Expenses		16.2	13.5	15.9
Charged to Other Accounts		0.0	0.0	0.0
Deductions		14.0	16.8	10.8
Balance at End of Period		19.5	$ 17.3	$ 20.6
Capital loss from sale of SoCore Energy
Movement in Valuation and Qualifying Accounts
Recorded valuation allowance	$ 4.0	4.0
Non-California state | Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Charged to Other Accounts		$ 4.0