Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 10	$ 9
Accounts receivable - trade (less allowance for doubtful accounts)	445	437
Unbilled revenue	323	295
Miscellaneous accounts and notes receivable	70	63
Inventories	522	527
Current regulatory assets	144	149
Other current assets	98	113
Total current assets	1,612	1,593
Property, Plant and Equipment, Net	21,466	20,113
Investments and Other Assets:
Nuclear decommissioning trust fund	704	607
Goodwill	411	411
Regulatory assets	1,230	1,437
Other assets	522	538
Total investments and other assets	2,867	2,993
TOTAL ASSETS	25,945	24,699
Current Liabilities:
Current maturities of long-term debt	841	681
Short-term debt	484	558
Accounts and wages payable	902	805
Taxes accrued	52	46
Interest accrued	99	93
Customer deposits	108	107
Current regulatory liabilities	128	110
Other current liabilities	326	274
Total current liabilities	2,940	2,674
Long-term Debt, Net	7,094	6,595
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	2,506	4,264
Accumulated deferred investment tax credits	49	55
Regulatory liabilities	4,387	1,985
Asset retirement obligations	638	635
Pension and other postretirement benefits	545	769
Other deferred credits and liabilities	460	477
Total deferred credits and other liabilities	8,585	8,185
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	2	2
Other paid-in capital, principally premium on common stock	5,540	5,556
Retained earnings	1,660	1,568
Accumulated other comprehensive loss	(18)	(23)
Total stockholders' equity	7,184	7,103
Noncontrolling Interests	142	142
Total equity	7,326	7,245
TOTAL LIABILITIES AND EQUITY	25,945	24,699
Union Electric Company
Current Assets:
Cash and cash equivalents	0	0
Advances to money pool	0	161
Accounts receivable - trade (less allowance for doubtful accounts)	200	187
Accounts receivable - affiliates	11	12
Unbilled revenue	165	154
Miscellaneous accounts and notes receivable	35	14
Inventories	388	392
Current regulatory assets	56	35
Other current assets	50	49
Total current assets	905	1,004
Property, Plant and Equipment, Net	11,751	11,478
Investments and Other Assets:
Nuclear decommissioning trust fund	704	607
Regulatory assets	395	619
Other assets	288	327
Total investments and other assets	1,387	1,553
TOTAL ASSETS	14,043	14,035
Current Liabilities:
Current maturities of long-term debt	384	431
Short-term debt	39	0
Accounts and wages payable	475	444
Accounts payable - affiliates	60	68
Taxes accrued	30	30
Interest accrued	54	54
Current regulatory liabilities	19	12
Other current liabilities	103	123
Total current liabilities	1,164	1,162
Long-term Debt, Net	3,577	3,563
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,650	3,013
Accumulated deferred investment tax credits	48	53
Regulatory liabilities	2,664	1,215
Asset retirement obligations	634	629
Pension and other postretirement benefits	213	291
Other deferred credits and liabilities	12	19
Total deferred credits and other liabilities	5,221	5,220
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	511	511
Other paid-in capital, principally premium on common stock	1,858	1,828
Preferred stock not subject to mandatory redemption	80	80
Retained earnings	1,632	1,671
Total stockholders' equity	4,081	4,090
TOTAL LIABILITIES AND EQUITY	14,043	14,035
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	0	0
Accounts receivable - trade (less allowance for doubtful accounts)	234	242
Accounts receivable - affiliates	9	10
Unbilled revenue	158	141
Miscellaneous accounts and notes receivable	35	22
Inventories	134	135
Current regulatory assets	87	108
Other current assets	15	25
Total current assets	672	683
Property, Plant and Equipment, Net	8,293	7,469
Investments and Other Assets:
Goodwill	411	411
Regulatory assets	822	816
Other assets	147	95
Total investments and other assets	1,380	1,322
TOTAL ASSETS	10,345	9,474
Current Liabilities:
Current maturities of long-term debt	457	250
Short-term debt	62	51
Accounts and wages payable	337	264
Accounts payable - affiliates	70	63
Taxes accrued	19	16
Interest accrued	33	33
Customer deposits	69	69
Environmental remediation	42	38
Current regulatory liabilities	92	78
Other current liabilities	177	109
Total current liabilities	1,358	971
Long-term Debt, Net	2,373	2,338
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,021	1,631
Accumulated deferred investment tax credits	1	2
Regulatory liabilities	1,629	768
Pension and other postretirement benefits	285	346
Accrued Environmental Loss Contingencies, Noncurrent	134	162
Other deferred credits and liabilities	234	222
Total deferred credits and other liabilities	3,304	3,131
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	0	0
Other paid-in capital, principally premium on common stock	2,013	2,005
Preferred stock not subject to mandatory redemption	62	62
Retained earnings	1,235	967
Total stockholders' equity	3,310	3,034
TOTAL LIABILITIES AND EQUITY	$ 10,345	$ 9,474