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Regulatory Assets and Liabilities (Tables)

6 Months Ended

Mar. 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 March 31, 2023						At September 30, 2022
Current regulatory assets
Unrealized losses on interest rate derivatives			$	41					$	47
Unrealized losses on commodity derivatives			249						14
Fuel cost adjustment receivable			38						77
Total current regulatory assets			328						138
Non-current regulatory assets
Retirement benefit plans deferred costs			1,776						1,839
Non-nuclear decommissioning costs			2,688						2,856
Unrealized losses on interest rate derivatives			544						479
Nuclear decommissioning costs			631						821
Unrealized losses on commodity derivatives			46						1
Other non-current regulatory assets			135						138
Total non-current regulatory assets			5,820						6,134
Total regulatory assets			$	6,148					$	6,272
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	216					$	218
Fuel cost adjustment			3						—
Unrealized gains on commodity derivatives			25						173
Total current regulatory liabilities			244						391
Non-current regulatory liabilities
Retirement benefit plans deferred credits			62						70
Unrealized gains on commodity derivatives			6						102
Total non-current regulatory liabilities			68						172
Total regulatory liabilities			$	312					$	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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