Regulatory Assets, Liabilities, And Balancing Accounts (Tables)

9 Months Ended

Sep. 30, 2011

Regulatory Assets, Liabilities, And Balancing Accounts [Abstract]

Long-Term Regulatory Assets

	Balance at
(in millions)	September 30, 2011		December 31, 2010
Pension benefits		$  1,801		$  1,759
Deferred income taxes		1,371		1,250
Utility retained generation		628		666
Energy recovery bonds		435		735
Environmental compliance costs		470		450
Price risk management		297		424
Undepreciated conventional electromechanical meters		260		-
Unamortized loss, net of gain, on reacquired debt		168		181
Other		284		381
Total long-term regulatory assets		$  5,714		$  5,846

Long-Term Regulatory Liabilities

	Balance at
(in millions)	September 30, 2011		December 31, 2010
Cost of removal obligation		$  3,394		$  3,229
Recoveries in excess of ARO		559		600
Public purpose programs		500		573
Other		143		123
Total long-term regulatory liabilities		$  4,596		$  4,525

Current Regulatory Balancing Accounts, Net

	Receivable (Payable)
	Balance at
(in millions)	September 30, 2011		December 31, 2010
Utility generation		$  173		$  303
Distribution revenue adjustment mechanism		145		145
Gas fixed cost		115		56
Public purpose programs		98		164
Hazardous substance		57		38
Energy recovery bonds		(118)		(34)
Energy procurement		(70)		(25)
Other		242		202
Total regulatory balancing accounts, net		$  642		$  849