Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 51.5	$ 53.9	$ 61.8
Charged to Costs and Expenses	32.2	35.2	26.4
Charged to Other Accounts	0.0	0.0	0.0
Deductions	34.0	37.6	34.3
Balance at End of Period	49.7	51.5	53.9
Recorded valuation allowance	30.0
Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	32.0	36.6	41.2
Charged to Costs and Expenses	22.2	19.0	12.9
Charged to Other Accounts	0.0	0.0	0.0
Deductions	18.4	23.6	17.5
Balance at End of Period	35.8	32.0	36.6
All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	19.5	17.3	20.6
Charged to Costs and Expenses	10.0	16.2	13.5
Charged to Other Accounts	0.0	0.0	0.0
Deductions	15.6	14.0	16.8
Balance at End of Period	13.9	19.5	17.3
Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	36.0	28.0	24.0
Charged to Costs and Expenses	0.0	0.0	0.0
Charged to Other Accounts	0.0	8.0	4.0
Deductions	1.0	0.0	0.0
Balance at End of Period	35.0	36.0	28.0
Southern California Edison Company
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	51.1	53.3	61.1
Charged to Costs and Expenses	32.0	35.1	26.4
Charged to Other Accounts	0.0	0.0	0.0
Deductions	33.7	37.3	34.2
Balance at End of Period	49.4	51.1	53.3
Southern California Edison Company | Customers
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	31.6	36.0	40.5
Charged to Costs and Expenses	22.0	18.9	12.9
Charged to Other Accounts	0.0	0.0	0.0
Deductions	18.1	23.3	17.4
Balance at End of Period	35.5	31.6	36.0
Southern California Edison Company | All others
Movement in Valuation and Qualifying Accounts
Balance at Beginning of Period	19.5	17.3	20.6
Charged to Costs and Expenses	10.0	16.2	13.5
Charged to Other Accounts	0.0	0.0	0.0
Deductions	15.6	14.0	16.8
Balance at End of Period	13.9	19.5	$ 17.3
Capital loss from sale of SoCore Energy
Movement in Valuation and Qualifying Accounts
Recorded valuation allowance	$ 5.0	4.0
Non-California state | Tax valuation allowance
Movement in Valuation and Qualifying Accounts
Charged to Other Accounts		$ 4.0