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Property, Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) MW
Terra Nova Renewable Partners \| Nonregulated Solar Projects \| Scenario Forecast
Property Plant And Equipment [Line Items]
Consideration	$ 450
Gain on held for sale		$ 25
Gain on held for sale, after tax		$ 27
Terra Nova Renewable Partners \| Nonregulated Solar Projects \| Scenario Forecast \| SBL Holdco
Property Plant And Equipment [Line Items]
Percentage of controlling interest in nonregulated solar projects	67.00%
Acquisition of Solar Project at Schools in Virginia
Property Plant And Equipment [Line Items]
Anticipated projected cost			$ 65
Aggregate generation capacity \| MW			31