Regulatory Assets, Liabilities, And Balancing Accounts (Tables)

9 Months Ended

Sep. 30, 2012

Long-Term Regulatory Assets

	Balance at
(in millions)	September 30, 2012		December 31, 2011
Pension benefits	$	3,019	$	2,899
Deferred income taxes		1,584		1,444
Utility retained generation		567		613
Environmental compliance costs		576		520
Price risk management		223		339
Electromechanical meters		207		247
Unamortized loss, net of gain, on reacquired debt		147		163
Other		204		281
Total long-term regulatory assets	$	6,527	$	6,506

Long-Term Regulatory Liabilities

	Balance at
(in millions)	September 30, 2012		December 31, 2011
Cost of removal obligations	$	3,595	$	3,460
Recoveries in excess of AROs		649		611
Public purpose programs		613		499
Other		250		163
Total long-term regulatory liabilities	$	5,107	$	4,733

Current Regulatory Balancing Accounts, Net

	Receivable (Payable)
	Balance at
(in millions)	September 30, 2012			December 31, 2011
Distribution revenue adjustment mechanism	$	92		$	223
Utility generation		68			241
Hazardous substance		56			57
Public purpose programs		53			97
Gas fixed cost		105			16
Energy recovery bonds		(57	)		(105	)
Energy procurement		(19	)		(48	)
Other		151			227
Total regulatory balancing accounts, net	$	449		$	708