Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 27	$ 127
Accounts receivable, net	129	149
Unbilled revenues	75	93
Inventories	95	82
Regulatory assets - current	125	133
Other current assets	133	115
Total current assets	584	699
Electric utility plant, net	5,789	5,679
Regulatory assets - noncurrent	545	494
Nuclear decommissioning trust	90	90
Non-qualified benefit plan trust	34	32
Other noncurrent assets	49	48
Total assets	7,091	7,042
Current liabilities
Accounts payable	137	156
Liabilities from price risk mangement activities - current	107	106
Current portion of long-term debt	322	375
Accrued expenses and other current liabilities	243	236
Total current liabilities	809	873
Long-term debt, net of current portion	2,134	2,126
Regulatory liabilities - noncurrent	911	906
Deferred income taxes	636	625
Unfunded status of pension and postretirement plans	239	237
Liabilities from price risk mangement activities - noncurrent	176	122
Asset retirement obligations	119	116
Non-qualified benefit plan liabilities	106	105
Other noncurrent liabilities	22	21
Total liabilities	5,152	5,131
Commitments and contingencies (see notes)
Equity:
Preferred stock, no par value, 30,000,000 shares authorized; none issued and outstanding as of March 31, 2015 and December 31, 2014	0	0
Common stock, no par value, 160,000,000 shares authorized; 78,344,691 and 78,228,339 shares issued and outstanding as of March 31, 2015 and December 31, 2014, respectively	918	918
Accumulated other comprehensive loss	(7)	(7)
Retained earnings	1,028	1,000
Total equity	1,939	1,911
Total liabilities and equity	$ 7,091	$ 7,042