Regulatory Assets, Liabilities, And Balancing Accounts (Tables)

6 Months Ended

Jun. 30, 2012

Long-Term Regulatory Assets

	Balance at
(in millions)	June 30, 2012		December 31, 2011
Pension benefits		$ 2,978		$ 2,899
Deferred income taxes		1,520		1,444
Utility retained generation		582		613
Environmental compliance costs		557		520
Price risk management		259		339
Electromechanical meters		221		247
Unamortized loss, net of gain, on reacquired debt		152		163
Other		265		281
Total long-term regulatory assets		$ 6,534		$ 6,506

Long-Term Regulatory Liabilities

	Balance at
(in millions)	June 30, 2012		December 31, 2011
Cost of removal obligations		$ 3,555		$ 3,460
Recoveries in excess of AROs		669		611
Public purpose programs		607		499
Other		177		163
Total long-term regulatory liabilities		$ 5,008		$ 4,733

Current Regulatory Balancing Accounts, Net

	Receivable (Payable)
	Balance at
(in millions)	June 30, 2012		December 31, 2011
Distribution revenue adjustment mechanism		$ 428		$ 223
Utility generation		361		241
Hazardous substance		56		57
Public purpose programs		45		97
Gas fixed cost		(30)		16
Energy recovery bonds		(83)		(105)
Energy procurement		(161)		(48)
Other		148		227
Total regulatory balancing accounts, net		$ 764		$ 708