Regulatory Assets and Liabilities (Tables)

3 Months Ended

Dec. 31, 2017

Components of regulatory assets and regulatory liabilities are summarized in the table below:



Regulatory Assets and Liabilities
	At December 31, 2017		At September 30, 2017
Current regulatory assets
Deferred nuclear generating units	$	237	$	237
Unrealized losses on interest rate derivatives	89		93
Unrealized losses on commodity derivatives	57		68
Fuel cost adjustment receivable	12		1
Environmental agreements	3		2
Environmental cleanup costs - Kingston ash spill	44		44
Gallatin coal combustion residual facilities	10		—
Other current regulatory assets	3		2
Total current regulatory assets	455		447

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	3,945		4,009
Unrealized losses on interest rate derivatives	957		982
Gallatin coal combustion residual facilities	889		899
Nuclear decommissioning costs	771		823
Deferred nuclear generating units	703		759
Non-nuclear decommissioning costs	692		703
Environmental cleanup costs - Kingston ash spill	253		263
Unrealized losses on commodity derivatives	35		9
Environmental agreements	12		13
Other non-current regulatory assets	235		238
Total non-current regulatory assets	8,492		8,698
Total regulatory assets	$	8,947	$	9,145

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	149	$	153
Fuel cost adjustment	—		2
Unrealized gains on commodity derivatives	10		8
Total current regulatory liabilities	159		163

Non-current regulatory liabilities
Deferred other post-retirement benefits cost	19		23
Unrealized gains on commodity derivatives	6		2
Total non-current regulatory liabilities	25		25
Total regulatory liabilities	$	184	$	188