Regulatory Matters (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($)
NEW YORK
Regulatory Matters [Line Items]
Approved Return on Equity	8.70%
PENNSYLVANIA
Regulatory Matters [Line Items]
Proposed Base Rate Reduction	$ (7.7)
Proposed refund to customers from over-collection of OPEB expenses	$ 50.0