Regulatory Assets and Liabilities

3 Months Ended

Dec. 31, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory assets generally represent incurred costs that have been deferred because such costs are probable of future recovery in customer rates. Regulatory liabilities generally represent obligations to make refunds to customers for previous collections for costs that are not likely to be incurred or deferral of gains that will be credited to customers in future periods. Components of regulatory assets and regulatory liabilities are summarized in the table below:



Regulatory Assets and Liabilities⁽¹⁾
	At December 31, 2019		At September 30, 2019
Current regulatory assets
Unrealized losses on interest rate derivatives	$	89	$	89
Unrealized losses on commodity derivatives	49		39
Fuel cost adjustment receivable	21		28
Total current regulatory assets	159		156

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	4,678		4,756
Non-nuclear decommissioning costs	1,725		1,741
Nuclear decommissioning costs	765		868
Unrealized losses on interest rate derivatives	1,074		1,241
Unrealized losses on commodity contracts	17		15
Other non-current regulatory assets	151		142
Total non-current regulatory assets	8,410		8,763
Total regulatory assets	$	8,569	$	8,919

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	134	$	138
Unrealized gains on commodity derivatives	3		12
Total current regulatory liabilities	$	137	$	150

Note

(1) Amounts for Non-current regulatory liabilities were less than $1 million at December 31, 2019 and September 30, 2019, and are therefore not represented in the table above.