CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 116	$ 83
Accounts receivable, net	868	797
Accrued unbilled revenues	605	764
Inventories	492	610
Regulatory assets	422	424
Derivative instruments	28	44
Prepaid taxes	63	68
Prepayments and other	188	183
Total current assets	2,782	2,973
Property, plant and equipment, net	34,679	34,329
Other assets
Nuclear decommissioning fund and other investments	2,404	2,397
Regulatory assets	2,965	3,005
Derivative instruments	49	48
Other	280	278
Total other assets	5,698	5,728
Total assets	43,159	43,030
Current liabilities
Current portion of long-term debt	457	457
Short-term debt	1,025	814
Accounts payable	1,027	1,243
Regulatory liabilities	270	239
Taxes accrued	544	448
Accrued interest	147	174
Dividends payable	193	183
Derivative instruments	30	29
Other	429	501
Total current liabilities	4,122	4,088
Deferred credits and other liabilities
Deferred income taxes	3,905	3,845
Deferred investment tax credits	57	58
Regulatory liabilities	5,141	5,083
Asset retirement obligations	2,504	2,475
Derivative instruments	120	126
Customer advances	200	193
Pension and employee benefit obligations	884	1,042
Other	143	145
Total deferred credits and other liabilities	12,954	12,967
Commitments and contingencies
Capitalization
Long-term debt	14,522	14,520
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 508,661,859 and 507,762,881 shares outstanding at March 31, 2018 and Dec. 31, 2017, respectively	1,272	1,269
Additional paid in capital	5,903	5,898
Retained earnings	4,510	4,413
Accumulated other comprehensive loss	(124)	(125)
Total common stockholders’ equity	11,561	11,455
Total liabilities and equity	$ 43,159	$ 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.