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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 2022

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)
			2022						2021
Current regulatory assets
Unrealized losses on interest rate derivatives			$	47					$	114
Unrealized losses on commodity derivatives			14						3
Fuel cost adjustment receivable			77						79
Total current regulatory assets			138						196
Non-current regulatory assets
Retirement benefit plans deferred costs			1,839						3,668
Non-nuclear decommissioning costs			2,856						2,653
Unrealized losses on interest rate derivatives			479						1,122
Nuclear decommissioning costs			821						363
Unrealized losses on commodity derivatives			1						—
Other non-current regulatory assets			138						150
Total non-current regulatory assets			6,134						7,956
Total regulatory assets			$	6,272					$	8,152
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	218					$	130
Unrealized gains on commodity derivatives			173						210
Total current regulatory liabilities			391						340
Non-current regulatory liabilities
Retirement benefit plans deferred credits			70						—
Unrealized gains on commodity derivatives			102						40
Total non-current regulatory liabilities			172						40
Total regulatory liabilities			$	563					$	380

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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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