Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and Cash Equivalents, at Carrying Value	$ 16	$ 10
Accounts receivable - trade (less allowance for doubtful accounts)	463	445
Unbilled revenue	295	323
Miscellaneous accounts and notes receivable	79	70
Inventories	483	522
Current regulatory assets	134	144
Other current assets	63	98
Total current assets	1,533	1,612
Property, Plant and Equipment, Net	22,810	21,466
Investments and Other Assets:
Nuclear decommissioning trust fund	684	704
Goodwill	411	411
Regulatory Assets, Noncurrent	1,127	1,230
Other assets	650	522
Total investments and other assets	2,872	2,867
TOTAL ASSETS	27,215	25,945
Current Liabilities:
Current maturities of long-term debt	580	841
Short-term debt	597	484
Accounts and wages payable	817	902
Taxes accrued	53	52
Interest accrued	93	99
Customer deposits	116	108
Current regulatory liabilities	149	128
Other current liabilities	282	326
Total current liabilities	2,687	2,940
Long-term Debt, Net	7,859	7,094
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	2,623	2,506
Accumulated deferred investment tax credits	43	49
Regulatory Liability, Noncurrent	4,637	4,387
Asset retirement obligations	627	638
Pension and other postretirement benefits	558	545
Other deferred credits and liabilities	408	460
Total deferred credits and other liabilities	8,896	8,585
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	2	2
Other paid-in capital, principally premium on common stock	5,627	5,540
Retained earnings	2,024	1,660
Accumulated other comprehensive loss	(22)	(18)
Total stockholders' equity	7,631	7,184
Stockholders' Equity Attributable to Noncontrolling Interest	142	142
Total equity	7,773	7,326
TOTAL LIABILITIES AND EQUITY	27,215	25,945
Union Electric Company
Current Assets:
Cash and Cash Equivalents, at Carrying Value	0	0
Accounts receivable - trade (less allowance for doubtful accounts)	223	200
Accounts Receivable, Related Parties, Current	14	11
Unbilled revenue	155	165
Miscellaneous accounts and notes receivable	42	35
Inventories	358	388
Current regulatory assets	14	56
Other current assets	26	50
Total current assets	832	905
Property, Plant and Equipment, Net	12,103	11,751
Investments and Other Assets:
Nuclear decommissioning trust fund	684	704
Regulatory Assets, Noncurrent	366	395
Other assets	306	288
Total investments and other assets	1,356	1,387
TOTAL ASSETS	14,291	14,043
Current Liabilities:
Current maturities of long-term debt	580	384
Short-term debt	55	39
Accounts and wages payable	428	475
Accounts Payable, Related Parties, Current	69	60
Taxes accrued	27	30
Interest accrued	52	54
Current regulatory liabilities	68	19
Other current liabilities	123	103
Total current liabilities	1,402	1,164
Long-term Debt, Net	3,418	3,577
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,534	1,650
Accumulated deferred investment tax credits	42	48
Regulatory Liability, Noncurrent	2,799	2,664
Asset retirement obligations	623	634
Pension and other postretirement benefits	228	213
Other deferred credits and liabilities	16	12
Total deferred credits and other liabilities	5,242	5,221
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	511	511
Other paid-in capital, principally premium on common stock	1,903	1,858
Preferred stock not subject to mandatory redemption (in shares)	80	80
Retained earnings	1,735	1,632
Total stockholders' equity	4,229	4,081
TOTAL LIABILITIES AND EQUITY	14,291	14,043
Ameren Illinois Company
Current Assets:
Cash and Cash Equivalents, at Carrying Value	0	0
Accounts receivable - trade (less allowance for doubtful accounts)	224	234
Accounts Receivable, Related Parties, Current	21	9
Unbilled revenue	140	158
Miscellaneous accounts and notes receivable	40	35
Inventories	125	134
Current regulatory assets	110	87
Other current assets	16	15
Total current assets	676	672
Property, Plant and Equipment, Net	9,198	8,293
Investments and Other Assets:
Goodwill	411	411
Regulatory Assets, Noncurrent	759	822
Other assets	275	147
Total investments and other assets	1,445	1,380
TOTAL ASSETS	11,319	10,345
Current Liabilities:
Current maturities of long-term debt	0	457
Short-term debt	72	62
Accounts and wages payable	302	337
Accounts Payable, Related Parties, Current	58	70
Taxes accrued	23	19
Interest accrued	31	33
Customer deposits	76	69
Environmental remediation	42	42
Current regulatory liabilities	62	92
Other current liabilities	130	177
Total current liabilities	796	1,358
Long-term Debt, Net	3,296	2,373
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,119	1,021
Regulatory Liability, Noncurrent	1,741	1,629
Pension and other postretirement benefits	280	285
Accrued Environmental Loss Contingencies, Noncurrent	109	134
Other deferred credits and liabilities	204	235
Total deferred credits and other liabilities	3,453	3,304
Commitments and Contingencies (Notes 2, 9, and 14)
Stockholders' Equity:
Common stock	0	0
Other paid-in capital, principally premium on common stock	2,173	2,013
Preferred stock not subject to mandatory redemption (in shares)	62	62
Retained earnings	1,539	1,235
Total stockholders' equity	3,774	3,310
TOTAL LIABILITIES AND EQUITY	$ 11,319	$ 10,345