Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 41	$ 57
Receivables, less allowances of $74 and $75 for uncollectible accounts at respective dates	721	760
Accrued unbilled revenue	726	519
Inventory	335	350
Prepaid taxes	275	278
Derivative assets	45	65
Regulatory assets	586	494
Other current assets	234	89
Total current assets	2,963	2,612
Nuclear decommissioning trusts	3,810	3,592
Other investments	110	93
Total investments	3,920	3,685
Utility property, plant and equipment, less accumulated depreciation of $ $7,153 and $6,894 at respective dates	28,708	27,569
Nonutility property, plant and equipment, less accumulated depreciation of $113 and $107 at respective dates	70	73
Total property, plant and equipment	28,778	27,642
Derivative assets	59	70
Regulatory assets	5,776	5,815
Other long-term assets	507	491
Total long-term assets	6,342	6,376
Total assets	42,003	40,315
LIABILITIES AND EQUITY
Short-term debt	300	419
Accounts payable	1,070	1,319
Accrued taxes	35	49
Accrued interest	192	167
Customer deposits	195	199
Derivative liabilities	173	266
Regulatory liabilities	721	670
Other current liabilities	589	759
Total current liabilities	3,275	3,848
Long-term debt	8,827	8,431
Deferred income taxes	6,339	5,781
Deferred investment tax credits	81	84
Customer advances	150	138
Derivative liabilities	796	805
Pensions and benefits	2,333	2,461
Asset retirement obligations	2,691	2,610
Regulatory liabilities	5,038	4,670
Other deferred credits and other long-term liabilities	1,657	1,529
Total deferred credits and other liabilities	19,085	18,078
Total liabilities	31,187	30,357
Commitments and contingencies (Note 9)
Common stock, no par value (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date)	2,168	2,168
Additional paid-in capital	595	596
Accumulated other comprehensive loss	(24)	(24)
Retained earnings	6,282	6,173
Total common shareholder's equity	9,021	8,913
Preferred and preference stock	1,795	1,045
Total equity	10,816	9,958
Total liabilities and equity	$ 42,003	$ 40,315