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Regulatory Assets and Liabilities (Tables)

3 Months Ended

Dec. 31, 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 (in millions)
			At December 31, 2023						At September 30, 2023
Current regulatory assets
Unrealized losses on interest rate derivatives			$	37					$	31
Unrealized losses on commodity derivatives			213						136
Fuel cost adjustment receivable			—						11
Other current regulatory assets			1						—
Total current regulatory assets			251						178
Non-current regulatory assets
Retirement benefit plans deferred costs			1,438						1,440
Non-nuclear decommissioning costs			2,838						2,922
Unrealized losses on interest rate derivatives			459						272
Nuclear decommissioning costs			543						728
Unrealized losses on commodity derivatives			98						52
Other non-current regulatory assets			175						152
Total non-current regulatory assets			5,551						5,566
Total regulatory assets			$	5,802					$	5,744
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	190					$	201
Fuel cost adjustment			50						—
Unrealized gains on commodity derivatives			19						21
Total current regulatory liabilities			259						222
Non-current regulatory liabilities
Retirement benefit plans deferred credits			91						95
Unrealized gains on commodity derivatives			12						12
Total non-current regulatory liabilities			103						107
Total regulatory liabilities			$	362					$	329

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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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