Consolidated Balance Sheets Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 107	$ 47
Accounts receivable, net	621	653
Income taxes receivable	0	70
Inventories:
Materials and supplies	200	196
Fuel	270	237
Deferred income taxes	126	129
Regulatory assets	76	74
Other current assets	77	77
Total current assets	1,477	1,483
Property, plant and equipment, net	17,777	17,374
Regulatory assets	1,754	1,810
Other assets	437	439
Total assets	21,445	21,106
Current liabilities:
Accounts payable	486	582
Income taxes payable	60	0
Accrued employee expenses	113	72
Accrued interest	115	105
Accrued property and other taxes	96	66
Derivative contracts	72	90
Short-term debt	0	688
Current portion of long-term debt and capital lease obligations	66	19
Regulatory liabilities	50	67
Other current liabilities	119	125
Total current liabilities	1,177	1,814
Regulatory liabilities	836	826
Long-term debt and capital lease obligations	6,806	6,194
Deferred income taxes	4,038	3,863
Other long-term liabilities	1,046	1,097
Total liabilities	13,903	13,794
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock	41	41
Common stock - 750 shares authorized, no par value, 357 shares issued and outstanding	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	3,031	2,801
Accumulated other comprehensive loss, net	(9)	(9)
Total shareholders' equity	7,542	7,312
Total liabilities and shareholders' equity	$ 21,445	$ 21,106