Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 2018

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



Regulatory Assets and Liabilities At September 30
	2018		2017
Current regulatory assets
Gallatin coal combustion residual facilities	$	38	$	—
Unrealized losses on interest rate derivatives	73		93
Environmental agreements	3		2
Unrealized losses on commodity contracts	4		68
Deferred nuclear generating units	—		237
Environmental cleanup costs – Kingston ash spill	266		44
Fuel cost adjustment receivable	30		1
Other current regulatory assets	—		2
Total current regulatory assets	414		447

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	3,119		4,009
Non-nuclear decommissioning costs	1,019		703
Gallatin CCR facilities	861		899
Nuclear decommissioning costs	784		823
Unrealized losses on interest rate derivatives	692		982
Environmental agreements	11		13
Unrealized losses on commodity contracts	8		9
Deferred nuclear generating units	—		759
Environmental cleanup costs - Kingston ash spill	—		263
Other non-current regulatory assets	118		238
Total non-current regulatory assets	6,612		8,698
Total regulatory assets	$	7,026	$	9,145

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	146	$	153
Fuel cost adjustment	—		2
Unrealized gains on commodity derivatives	41		8
Total current regulatory liabilities	187		163

Non-current regulatory liabilities
Deferred other post-retirement benefits cost	73		23
Unrealized gains on commodity derivatives	31		2
Total non-current regulatory liabilities	104		25
Total regulatory liabilities	$	291	$	188