Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 2019

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



Regulatory Assets and Liabilities At September 30
	2019		2018
Current regulatory assets
Unrealized losses on interest rate derivatives	$	89	$	73
Unrealized losses on commodity derivatives	39		4
Environmental agreements	—		3
Gallatin coal combustion residual facilities	—		38
Environmental cleanup costs - Kingston ash spill	—		266
Fuel cost adjustment receivable	28		30
Total current regulatory assets	156		414

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	4,756		3,119
Non-nuclear decommissioning costs	1,741		1,019
Unrealized losses on interest rate derivatives	1,241		692
Nuclear decommissioning costs	868		784
Unrealized losses on commodity derivatives	15		8
Environmental agreements	12		11
Gallatin coal combustion residual facilities	—		861
Other non-current regulatory assets	130		118
Total non-current regulatory assets	8,763		6,612
Total regulatory assets	$	8,919	$	7,026

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	138	$	146
Unrealized gains on commodity derivatives	12		41
Total current regulatory liabilities	150		187

Non-current regulatory liabilities
Deferred other post-retirement benefits cost	—		73
Unrealized gains on commodity derivatives	—		31
Total non-current regulatory liabilities	—		104
Total regulatory liabilities	$	150	$	291