Regulatory Assets and Liabilities (Tables)

9 Months Ended

Jun. 30, 2018

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



Regulatory Assets and Liabilities
	At June 30, 2018		At September 30, 2017
Current regulatory assets
Deferred nuclear generating units	$	237	$	237
Unrealized losses on interest rate derivatives	77		93
Unrealized losses on commodity derivatives	17		68
Fuel cost adjustment receivable	5		1
Environmental agreements	4		2
Environmental cleanup costs - Kingston ash spill	44		44
Gallatin coal combustion residual facilities	34		—
Other current regulatory assets	3		2
Total current regulatory assets	421		447

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	3,817		4,009
Unrealized losses on interest rate derivatives	771		982
Gallatin coal combustion residual facilities	865		899
Nuclear decommissioning costs	820		823
Deferred nuclear generating units	586		759
Non-nuclear decommissioning costs	689		703
Environmental cleanup costs - Kingston ash spill	232		263
Unrealized losses on commodity derivatives	14		9
Environmental agreements	11		13
Other non-current regulatory assets	201		238
Total non-current regulatory assets	8,006		8,698
Total regulatory assets	$	8,427	$	9,145

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	145	$	153
Fuel cost adjustment	—		2
Unrealized gains on commodity derivatives	21		8
Total current regulatory liabilities	166		163

Non-current regulatory liabilities
Deferred other post-retirement benefits cost	12		23
Unrealized gains on commodity derivatives	7		2
Total non-current regulatory liabilities	19		25
Total regulatory liabilities	$	185	$	188