Regulatory Assets and Liabilities (Tables)

6 Months Ended

Mar. 31, 2016

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



Regulatory Assets and Liabilities
	At March 31, 2016		At September 30, 2015
Current regulatory assets
Deferred nuclear generating units	$	237	$	237
Unrealized losses on commodity derivatives	190		162
Environmental agreements	48		47
Environmental cleanup costs - Kingston ash spill	43		43
Fuel cost adjustment receivable	30		15
Other current regulatory assets	2		2
Total current regulatory assets	550		506

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	5,549		5,565
Unrealized losses on interest rate derivatives	1,409		1,236
Nuclear decommissioning costs	982		1,003
Deferred nuclear generating units	953		1,042
Non-nuclear decommissioning costs	818		828
Environmental cleanup costs - Kingston ash spill	320		348
Unrealized losses on commodity derivatives	103		63
Environmental agreements	32		55
Other non-current regulatory assets	266		278
Total non-current regulatory assets	10,432		10,418
Total regulatory assets	$	10,982	$	10,924

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	150	$	164
Unrealized gains on commodity derivatives	3		—
Total current regulatory liabilities	153		164

Non-current regulatory liabilities
Unrealized gains on commodity derivatives	1		2
Total non-current regulatory liabilities	1		2
Total regulatory liabilities	$	154	$	166