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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 2020

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
			2020						2019(1)
Current regulatory assets
Unrealized losses on interest rate derivatives			$	114					$	89
Unrealized losses on commodity derivatives			4						39
Fuel cost adjustment receivable			12						28
Total current regulatory assets			130						156
Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs			5,193						4,756
Non-nuclear decommissioning costs			2,512						1,741
Unrealized losses on interest rate derivatives			1,506						1,241
Nuclear decommissioning costs			896						868
Unrealized losses on commodity derivatives			—						15
Other non-current regulatory assets			138						142
Total non-current regulatory assets			10,245						8,763
Total regulatory assets			$	10,375					$	8,919
Current regulatory liabilities
Fuel cost adjustment tax equivalents			$	115					$	138
Unrealized gains on commodity derivatives			26						12
Total current regulatory liabilities			141						150
Non-current regulatory liabilities
Unrealized gains on commodity derivatives			23						—
Total non-current regulatory liabilities			23						—
Total regulatory liabilities			$	164					$	150

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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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