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Regulatory Assets and Liabilities (Tables)

6 Months Ended

Mar. 31, 2021

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 March 31, 2021						At September 30, 2020
Current regulatory assets
Unrealized losses on interest rate derivatives			$	114					$	114
Unrealized losses on commodity derivatives			—						4
Fuel cost adjustment receivable			41						12
Total current regulatory assets			155						130
Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs			5,009						5,193
Non-nuclear decommissioning costs			2,604						2,512
Unrealized losses on interest rate derivatives			986						1,506
Nuclear decommissioning costs			482						896
Unrealized losses on commodity derivatives			4						—
Other non-current regulatory assets			145						138
Total non-current regulatory assets			9,230						10,245
Total regulatory assets			$	9,385					$	10,375
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	115					$	115
Unrealized gains on commodity derivatives			26						26
Total current regulatory liabilities			141						141
Non-current regulatory liabilities
Unrealized gains on commodity derivatives			5						23
Total regulatory liabilities			$	146					$	164

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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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