Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 88,000,000	$ 4,000,000
Accounts receivable, net	140,000,000	158,000,000
Unbilled revenues	60,000,000	95,000,000
Inventories	82,000,000	83,000,000
Regulatory assets - current	65,000,000	129,000,000
Other current assets	41,000,000	88,000,000
Total current assets	476,000,000	557,000,000
Electric utility plant, net	6,340,000,000	6,012,000,000
Regulatory assets - noncurrent	515,000,000	524,000,000
Nuclear decommissioning trust	41,000,000	40,000,000
Non-qualified benefit plan trust	34,000,000	33,000,000
Other noncurrent assets	49,000,000	44,000,000
Total assets	7,455,000,000	7,210,000,000
Current liabilities
Accounts payable	112,000,000	98,000,000
Liabilities from price risk mangement activities - current	66,000,000	130,000,000
Short-term debt	0	6,000,000
Current portion of long-term debt	0	133,000,000
Accrued expenses and other current liabilities	270,000,000	259,000,000
Total current liabilities	448,000,000	626,000,000
Long-term debt, net of current portion	2,325,000,000	2,060,000,000
Regulatory liabilities - noncurrent	958,000,000	928,000,000
Deferred income taxes	644,000,000	632,000,000
Unfunded status of pension and postretirement plans	267,000,000	259,000,000
Liabilities from price risk mangement activities - noncurrent	163,000,000	161,000,000
Asset retirement obligations	156,000,000	151,000,000
Non-qualified benefit plan liabilities	105,000,000	106,000,000
Other noncurrent liabilities	79,000,000	29,000,000
Total liabilities	5,145,000,000	4,952,000,000
Commitments and contingencies (see notes)
Equity:
Preferred stock, no par value, 30,000,000 shares authorized; none issued and outstanding as of September 30, 2016 and December 31, 2015	0	0
Common stock, no par value, 160,000,000 shares authorized; 88,926,626 and 88,792,751 shares issued and outstanding as of September 30, 2016 and December 31, 2015, respectively	1,199,000,000	1,196,000,000
Accumulated other comprehensive loss	(7,000,000)	(8,000,000)
Retained earnings	1,118,000,000	1,070,000,000
Total equity	2,310,000,000	2,258,000,000
Total liabilities and equity	$ 7,455,000,000	$ 7,210,000,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.