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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables)

12 Months Ended

Sep. 30, 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 September 30
	2013				2012
Current regulatory assets
Unrealized losses on commodity derivatives	$	183			$	310
Deferred nuclear generating units	237				237
Environmental agreements	73				87
Fuel cost adjustment receivable	—				68
Environmental cleanup costs – Kingston ash spill	68				72
Total current regulatory assets	561				774
Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	4,076				5,517
Unrealized losses on interest rate derivatives	808				1,332
Nuclear decommissioning costs	893				914
Environmental cleanup costs - Kingston ash spill	681				797
Construction costs	—				619
Non-nuclear decommissioning costs	571				550
Deferred nuclear generating units	1,438				473
Unrealized losses on commodity derivatives	139				335
Environmental agreements	189				237
Other non-current regulatory assets	336				353
Total non-current regulatory assets	9,131				11,127
Total regulatory assets	$	9,692			$	11,901
Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	176			$	173
Fuel cost adjustment liability	29				—
Unrealized gains on commodity derivatives	7				18
Total current regulatory liabilities	212				191
Non-current regulatory liabilities
Unrealized gains on commodity derivatives	1				109
Total non-current regulatory liabilities	1				109
Total regulatory liabilities	$	213			$	300

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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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