Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 8	$ 9
Accounts receivable - trade (less allowance for doubtful accounts)	457	437
Unbilled revenue	228	295
Miscellaneous accounts and notes receivable	67	63
Materials and supplies	467	527
Current regulatory assets	118	149
Other current assets	105	113
Total current assets	1,450	1,593
Property and Plant, Net	20,298	20,113
Investments and Other Assets:
Nuclear decommissioning trust fund	635	607
Goodwill	411	411
Regulatory assets	1,485	1,437
Other assets	532	538
Total investments and other assets	3,063	2,993
TOTAL ASSETS	24,811	24,699
Current Liabilities:
Current maturities of long-term debt	681	681
Short-term Debt	914	558
Accounts and wages payable	460	805
Taxes accrued	77	46
Interest accrued	100	93
Customer deposits	106	107
Current regulatory liabilities	144	110
Other current liabilities	280	274
Total current liabilities	2,762	2,674
Long-term Debt, Net	6,597	6,595
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	4,321	4,264
Accumulated deferred investment tax credits	53	55
Regulatory liabilities	1,982	1,985
Asset retirement obligations	641	635
Pension and other postretirement benefits	768	769
Other deferred credits and liabilities	481	477
Total deferred credits and other liabilities	8,246	8,185
Commitments and Contingencies
Stockholders' Equity:
Common Stock	2	2
Other paid-in capital	5,522	5,556
Retained earnings	1,563	1,568
Accumulated other comprehensive income (loss)	(23)	(23)
Stockholder's equity	7,064	7,103
Noncontrolling Interest	142	142
Total equity	7,206	7,245
TOTAL LIABILITIES AND EQUITY	24,811	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)	175	187
Accounts receivable - affiliates	15	12
Unbilled revenue	126	154
Miscellaneous accounts and notes receivable	23	14
Materials and supplies	381	392
Current regulatory assets	23	35
Other current assets	45	49
Total current assets	788	1,004
Property and Plant, Net	11,471	11,478
Investments and Other Assets:
Nuclear decommissioning trust fund	635	607
Regulatory assets	606	619
Other assets	314	327
Total investments and other assets	1,555	1,553
TOTAL ASSETS	13,814	14,035
Current Liabilities:
Current maturities of long-term debt	431	431
Short-term Debt	36	0
Accounts and wages payable	191	444
Accounts payable - affiliates	54	68
Taxes accrued	63	30
Interest accrued	53	54
Current regulatory liabilities	8	12
Other current liabilities	128	123
Total current liabilities	964	1,162
Long-term Debt, Net	3,564	3,563
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	3,017	3,013
Accumulated deferred investment tax credits	51	53
Regulatory liabilities	1,240	1,215
Asset retirement obligations	635	629
Pension and other postretirement benefits	292	291
Other deferred credits and liabilities	16	19
Total deferred credits and other liabilities	5,251	5,220
Commitments and Contingencies
Stockholders' Equity:
Common Stock	511	511
Other paid-in capital	1,828	1,828
Preferred stock	80	80
Retained earnings	1,616	1,671
Stockholder's equity	4,035	4,090
TOTAL LIABILITIES AND EQUITY	13,814	14,035
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	0	0
Accounts receivable - trade (less allowance for doubtful accounts)	270	242
Accounts receivable - affiliates	10	10
Unbilled revenue	102	141
Miscellaneous accounts and notes receivable	17	22
Materials and supplies	86	135
Current regulatory assets	91	108
Other current assets	16	25
Total current assets	592	683
Property and Plant, Net	7,596	7,469
Investments and Other Assets:
Goodwill	411	411
Regulatory assets	875	816
Other assets	95	95
Total investments and other assets	1,381	1,322
TOTAL ASSETS	9,569	9,474
Current Liabilities:
Current maturities of long-term debt	250	250
Short-term Debt	68	51
Accounts and wages payable	198	264
Accounts payable - affiliates	57	63
Taxes accrued	13	16
Interest accrued	42	33
Customer deposits	68	69
Mark-to-market derivative liabilities	18	15
Current environmental remediation	42	38
Current regulatory liabilities	118	78
Other current liabilities	88	94
Total current liabilities	962	971
Long-term Debt, Net	2,338	2,338
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,682	1,631
Accumulated deferred investment tax credits	2	2
Regulatory liabilities	739	768
Pension and other postretirement benefits	345	346
Environmental remediation	152	162
Other deferred credits and liabilities	236	222
Total deferred credits and other liabilities	3,156	3,131
Commitments and Contingencies
Stockholders' Equity:
Common Stock	0	0
Other paid-in capital	2,005	2,005
Preferred stock	62	62
Retained earnings	1,046	967
Stockholder's equity	3,113	3,034
TOTAL LIABILITIES AND EQUITY	$ 9,569	$ 9,474