CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents		$ 83	$ 85
Accounts receivable, net		797	776
Accrued unbilled revenues		764	730
Inventories		610	604
Regulatory assets		424	364
Derivative instruments		44	38
Prepaid Taxes		68	107
Prepayments and other		183	138
Total current assets		2,973	2,842
Property, plant and equipment, net		34,329	32,842
Other assets
Nuclear decommissioning fund and other investments		2,397	2,092
Regulatory assets		3,005	3,081
Derivative instruments		48	50
Deposits and other		278	248
Total other assets		5,728	5,471
Total assets		43,030	41,155
Current liabilities
Current portion of long-term debt		457	255
Short-term debt		814	392
Accounts payable		1,243	1,045
Regulatory liabilities	[1]	239	221
Taxes accrued		448	457
Accrued interest		174	173
Dividends payable		183	172
Derivative instruments		29	27
Other		501	505
Total current liabilities		4,088	3,247
Deferred credits and other liabilities
Deferred income taxes		3,845	6,784
Deferred investment tax credits		58	63
Regulatory liabilities		5,083	1,383
Asset retirement obligations		2,475	2,782
Derivative instruments		126	148
Customer advances		193	195
Pension and employee benefit obligations		1,042	1,112
Other		145	225
Total deferred credits and other liabilities		12,967	12,692
Commitments and contingencies
Capitalization
Long-term debt		14,520	14,195
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 507,762,881 and 507,222,795 shares outstanding at Dec. 31, 2017 and 2016, respectively		1,269	1,268
Additional paid in capital		5,898	5,881
Retained earnings		4,413	3,982
Accumulated other comprehensive loss		(125)	(110)
Total common stockholders’ equity		11,455	11,021
Total liabilities and equity		$ 43,030	$ 41,155

[1] Revenue subject to refund of $15 million and $46 million for 2017 and 2016, respectively, is included in other current liabilities.