Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 23	$ 53
Accounts receivable, net	701	700
Income taxes receivable	133	0
Inventories:
Materials and supplies	218	213
Fuel	199	241
Deferred income taxes	28	66
Regulatory assets	131	94
Other current assets	92	75
Total current assets	1,525	1,442
Property, plant and equipment, net	18,719	18,507
Regulatory assets	1,574	1,290
Other assets	449	420
Total assets	22,267	21,659
Current liabilities:
Accounts payable	465	504
Income taxes payable	0	22
Accrued employee expenses	76	79
Accrued interest	110	110
Accrued property and other taxes	59	58
Short-term debt	20	0
Current portion of long-term debt and capital lease obligations	134	238
Regulatory liabilities	34	55
Other current liabilities	222	208
Total current liabilities	1,120	1,274
Regulatory liabilities	910	879
Long-term debt and capital lease obligations	6,919	6,639
Deferred income taxes	4,609	4,359
Other long-term liabilities	953	721
Total liabilities	14,511	13,872
Commitments and contingencies (Note 13)
Shareholders' equity:
Preferred stock	2	2
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	3,288	3,315
Accumulated other comprehensive loss, net	(13)	(9)
Total shareholders' equity	7,756	7,787
Total liabilities and shareholders' equity	$ 22,267	$ 21,659