Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 13	$ 292
Accounts receivable - trade (less allowance for doubtful accounts)	428	388
Unbilled revenue	186	239
Miscellaneous accounts and notes receivable	56	98
Materials and supplies	483	538
Current regulatory assets	215	260
Other current assets	63	88
Assets of discontinued operations	14	14
Total current assets	1,458	1,917
Property and Plant, Net	19,000	18,799
Investments and Other Assets:
Nuclear decommissioning trust fund	567	556
Goodwill	411	411
Regulatory assets	1,376	1,382
Other assets	573	575
Total investments and other assets	2,927	2,924
TOTAL ASSETS	23,385	23,640
Current Liabilities:
Current maturities of long-term debt	135	395
Short-term Debt	581	301
Accounts and wages payable	429	777
Taxes accrued	77	43
Interest accrued	99	89
Customer deposits	98	100
Current regulatory liabilities	87	80
Other current liabilities	305	279
Liabilities of discontinued operations	28	29
Total current liabilities	1,839	2,093
Long-term Debt, Net	6,881	6,880
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	3,928	3,885
Accumulated deferred investment tax credits	59	60
Regulatory liabilities	1,931	1,905
Asset retirement obligations	625	618
Pension and other postretirement benefits	581	580
Other deferred credits and liabilities	530	531
Total deferred credits and other liabilities	$ 7,654	$ 7,579
Commitments and Contingencies
Stockholders' Equity:
Common Stock	$ 2	$ 2
Other paid-in capital	5,539	5,616
Retained earnings	1,333	1,331
Accumulated other comprehensive income (loss)	(5)	(3)
Stockholder's equity	6,869	6,946
Noncontrolling Interest	142	142
Total equity	7,011	7,088
TOTAL LIABILITIES AND EQUITY	23,385	23,640
Union Electric Company
Current Assets:
Cash and cash equivalents	0	199
Advances to money pool	0	36
Accounts receivable - trade (less allowance for doubtful accounts)	150	174
Accounts receivable - affiliates	16	54
Unbilled revenue	105	128
Miscellaneous accounts and notes receivable	44	78
Materials and supplies	389	387
Current regulatory assets	55	89
Other current assets	29	41
Total current assets	788	1,186
Property and Plant, Net	11,181	11,183
Investments and Other Assets:
Nuclear decommissioning trust fund	567	556
Regulatory assets	591	605
Other assets	316	321
Total investments and other assets	1,474	1,482
TOTAL ASSETS	13,443	13,851
Current Liabilities:
Current maturities of long-term debt	6	266
Short-term Debt	165	0
Accounts and wages payable	174	417
Accounts payable - affiliates	59	56
Taxes accrued	64	31
Interest accrued	50	59
Current regulatory liabilities	15	28
Other current liabilities	132	120
Total current liabilities	665	977
Long-term Debt, Net	3,845	3,844
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	2,857	2,844
Accumulated deferred investment tax credits	57	58
Regulatory liabilities	1,181	1,172
Asset retirement obligations	619	612
Pension and other postretirement benefits	236	234
Other deferred credits and liabilities	27	28
Total deferred credits and other liabilities	$ 4,977	$ 4,948
Commitments and Contingencies
Stockholders' Equity:
Common Stock	$ 511	$ 511
Other paid-in capital	1,822	1,822
Preferred stock	80	80
Retained earnings	1,543	1,669
Stockholder's equity	3,956	4,082
TOTAL LIABILITIES AND EQUITY	13,443	13,851
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	0	71
Advances to money pool	58	0
Accounts receivable - trade (less allowance for doubtful accounts)	262	204
Accounts receivable - affiliates	10	22
Unbilled revenue	81	111
Miscellaneous accounts and notes receivable	12	19
Materials and supplies	94	151
Current regulatory assets	156	167
Other current assets	13	15
Total current assets	686	760
Property and Plant, Net	6,956	6,848
Investments and Other Assets:
Goodwill	411	411
Regulatory assets	777	771
Other assets	114	113
Total investments and other assets	1,302	1,295
TOTAL ASSETS	8,944	8,903
Current Liabilities:
Current maturities of long-term debt	129	129
Short-term Debt	0	0
Accounts and wages payable	180	249
Accounts payable - affiliates	55	66
Taxes accrued	12	13
Interest accrued	44	28
Customer deposits	67	69
Mark-to-market derivative liabilities	51	45
Current environmental remediation	38	28
Current regulatory liabilities	55	39
Other current liabilities	82	86
Total current liabilities	713	752
Long-term Debt, Net	2,343	2,342
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,518	1,480
Accumulated deferred investment tax credits	2	2
Regulatory liabilities	749	732
Pension and other postretirement benefits	271	271
Environmental remediation	187	205
Other deferred credits and liabilities	236	222
Total deferred credits and other liabilities	$ 2,963	$ 2,912
Commitments and Contingencies
Stockholders' Equity:
Common Stock	$ 0	$ 0
Other paid-in capital	2,005	2,005
Preferred stock	62	62
Retained earnings	854	825
Accumulated other comprehensive income (loss)	4	5
Stockholder's equity	2,925	2,897
TOTAL LIABILITIES AND EQUITY	$ 8,944	$ 8,903