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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 2023

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

Components of regulatory assets and regulatory liabilities are summarized in the table below. 

Regulatory Assets and Liabilities  At September 30 (in millions)
			2023						2022
Current regulatory assets
Unrealized losses on interest rate derivatives			$	31					$	47
Unrealized losses on commodity derivatives			136						14
Fuel cost adjustment receivable			11						77
Total current regulatory assets			178						138
Non-current regulatory assets
Retirement benefit plans deferred costs			1,440						1,839
Non-nuclear decommissioning costs			2,922						2,856
Unrealized losses on interest rate derivatives			272						479
Nuclear decommissioning costs			728						821
Unrealized losses on commodity derivatives			52						1
Other non-current regulatory assets			152						138
Total non-current regulatory assets			5,566						6,134
Total regulatory assets			$	5,744					$	6,272
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	201					$	218
Unrealized gains on commodity derivatives			21						173
Total current regulatory liabilities			222						391
Non-current regulatory liabilities
Retirement benefit plans deferred credits			95						70
Unrealized gains on commodity derivatives			12						102
Total non-current regulatory liabilities			107						172
Total regulatory liabilities			$	329					$	563

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- Definition

Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods

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