Subsequent Events (Details) - Public Safety Power Shut-offs Event - USD ($)	3 Months Ended
	Dec. 31, 2019	Oct. 09, 2019
Forecast
Subsequent Event [Line Items]
Accrued losses	$ 90,000,000
Subsequent event
Subsequent Event [Line Items]
Automatic credit or rebate, per customer		$ 100
Automatic credit or rebate, per small business		$ 250