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Regulatory Assets and Liabilities (Tables)

3 Months Ended

Dec. 31, 2013

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

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

Regulatory Assets and Liabilities
	At December 31, 2013				At September 30, 2013
Current regulatory assets
Deferred nuclear generating units	$	237			$	237
Unrealized losses on commodity derivatives	154				183
Environmental agreements	81				73
Environmental cleanup costs - Kingston ash spill	64				68
Fuel cost adjustment receivable	26				—
Total current regulatory assets	562				561
Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	4,011				4,076
Unrealized losses on interest rate derivatives	669				808
Nuclear decommissioning costs	856				893
Environmental cleanup costs - Kingston ash spill	518				681
Non-nuclear decommissioning costs	570				571
Deferred nuclear generating units	1,411				1,438
Environmental agreements	164				189
Unrealized losses on commodity derivatives	133				139
Other non-current regulatory assets	328				336
Total non-current regulatory assets	8,660				9,131
Total regulatory assets	$	9,222			$	9,692
Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	169			$	176
Fuel cost adjustment liability	—				29
Unrealized gains on commodity derivatives	5				7
Total current regulatory liabilities	174				212
Non-current regulatory liabilities
Unrealized gains on commodity derivatives	1				1
Total non-current regulatory liabilities	1				1
Total regulatory liabilities	$	175			$	213

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- Definition

Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods

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