Consolidated Balance Sheets Statement (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 45	$ 47
Accounts receivable, net	581	653
Income taxes receivable	87	70
Inventories:
Materials and supplies	200	196
Fuel	256	237
Deferred income taxes	132	129
Regulatory assets	94	74
Other current assets	76	77
Total current assets	1,471	1,483
Property, plant and equipment, net	17,571	17,374
Regulatory assets	1,813	1,810
Other assets	433	439
Total assets	21,288	21,106
Current liabilities:
Accounts payable	454	582
Accrued employee expenses	109	72
Accrued interest	100	105
Accrued property and other taxes	93	66
Derivative contracts	168	90
Short-term debt	0	688
Current portion of long-term debt and capital lease obligations	24	19
Regulatory liabilities	65	67
Other current liabilities	116	125
Total current liabilities	1,129	1,814
Regulatory liabilities	825	826
Derivative contracts	98	66
Long-term debt and capital lease obligations	6,848	6,194
Deferred income taxes	3,959	3,863
Other long-term liabilities	1,017	1,031
Total liabilities	13,876	13,794
Commitments and contingencies (Note 9)
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	2,901	2,801
Accumulated other comprehensive loss, net	(9)	(9)
Total shareholders' equity	7,412	7,312
Total liabilities and shareholders' equity	$ 21,288	$ 21,106