CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 332	$ 83
Accounts receivable, net	808	797
Accrued unbilled revenues	648	764
Inventories	511	610
Regulatory assets	440	424
Derivative instruments	75	44
Prepaid taxes	78	68
Prepayments and other	164	183
Total current assets	3,056	2,973
Property, plant and equipment, net	35,289	34,329
Other assets
Nuclear decommissioning fund and other investments	2,398	2,397
Regulatory assets	3,177	3,005
Derivative instruments	47	48
Other	273	278
Total other assets	5,895	5,728
Total assets	44,240	43,030
Current liabilities
Current portion of long-term debt	856	457
Short-term debt	682	814
Accounts payable	1,092	1,243
Regulatory liabilities	395	239
Taxes accrued	316	448
Accrued interest	176	174
Dividends payable	193	183
Derivative instruments	27	29
Other	441	501
Total current liabilities	4,178	4,088
Deferred credits and other liabilities
Deferred income taxes	3,973	3,845
Deferred investment tax credits	56	58
Regulatory liabilities	5,113	5,083
Asset retirement obligations	2,534	2,475
Derivative instruments	113	126
Customer advances	202	193
Pension and employee benefit obligations	884	1,042
Other	226	145
Total deferred credits and other liabilities	13,101	12,967
Commitments and contingencies
Capitalization
Long-term debt	15,311	14,520
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 508,898,420 and 507,762,881 shares outstanding at June 30, 2018 and Dec. 31, 2017, respectively	1,272	1,269
Additional paid in capital	5,920	5,898
Retained earnings	4,580	4,413
Accumulated other comprehensive loss	(122)	(125)
Total common stockholders’ equity	11,650	11,455
Total liabilities and equity	$ 44,240	$ 43,030

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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- 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.