Regulatory Assets, Liabilities, And Balancing Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Regulatory Assets, Liabilities, And Balancing Accounts [Abstract]

Long-Term Regulatory Assets

	Balance at December 31,
(in millions)	2012		2011
Pension benefits	$	3,275	$	2,899
Deferred income taxes		1,627		1,444
Utility retained generation		552		613
Environmental compliance costs		604		520
Price risk management		210		339
Electromechanical meters		194		247
Unamortized loss, net of gain, on reacquired debt		141		163
Other		206		281
Total long-term regulatory assets	$	6,809	$	6,506

Long-Term Regulatory Liabilities

	Balance at December 31,
(in millions)	2012		2011
Cost of removal obligations	$	3,625	$	3,460
Recoveries in excess of AROs		620		611
Public purpose programs		590		499
Other		253		163
Total long-term regulatory liabilities	$	5,088	$	4,733

Current Regulatory Balancing Accounts, Net

	Receivable (Payable)
	Balance at December 31,
(in millions)	2012		2011
Distribution revenue adjustment mechanism	$	219	$	223
Utility generation		117		241
Hazardous substance		56		57
Public purpose programs		(83)		97
Gas fixed cost		44		16
Energy recovery bonds		(43)		(105)
Energy procurement		77		(48)
Department of Energy Settlement		(250)		-
Other		165		227
Total regulatory balancing accounts, net	$	302	$	708