Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 85	$ 25
Accounts receivable - trade (less allowance for doubtful accounts)	507	494
Unbilled revenue	272	319
Miscellaneous accounts receivable	82	106
Inventories	679	733
Current regulatory assets	356	365
Other current assets	103	139
Total current assets	2,084	2,181
Property, Plant, and Equipment, Net	34,114	33,776
Investments and Other Assets:
Nuclear decommissioning trust fund	1,232	1,150
Goodwill	411	411
Regulatory assets	1,904	1,810
Pension and other postretirement benefits	597	581
Other assets	964	921
Total investments and other assets	5,108	4,873
TOTAL ASSETS	41,306	40,830
Current Liabilities:
Current maturities of long-term debt	1,149	849
Short-term debt	868	536
Accounts and wages payable	647	1,136
Customer deposits	190	176
Other current liabilities	651	648
Total current liabilities	3,505	3,345
Long-term Debt, Net	15,167	15,121
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	4,251	4,176
Regulatory liabilities	5,593	5,512
Asset retirement obligations	779	772
Other deferred credits and liabilities	439	426
Total deferred credits and other liabilities	11,062	10,886
Commitments and Contingencies
Shareholders’ Equity:
Common Stock	3	3
Other paid-in capital, principally premium on common stock	7,228	7,216
Retained earnings	4,219	4,136
Accumulated other comprehensive loss	(7)	(6)
Total shareholders’ equity	11,443	11,349
Noncontrolling Interests	129	129
Total equity	11,572	11,478
TOTAL LIABILITIES AND EQUITY	41,306	40,830
Union Electric Company
Current Assets:
Cash and cash equivalents	2	0
Unbilled revenue	140	163
Miscellaneous accounts receivable	34	26
Inventories	499	508
Current regulatory assets	124	101
Other current assets	52	68
Total current assets	1,077	1,142
Property, Plant, and Equipment, Net	17,418	17,250
Investments and Other Assets:
Nuclear decommissioning trust fund	1,232	1,150
Regulatory assets	738	755
Pension and other postretirement benefits	161	157
Other assets	157	152
Total investments and other assets	2,288	2,214
TOTAL ASSETS	20,783	20,606
Current Liabilities:
Current maturities of long-term debt	350	350
Short-term debt	444	170
Borrowings from money pool	0	306
Taxes accrued	80	28
Other current liabilities	206	222
Total current liabilities	1,432	1,747
Long-term Debt, Net	6,336	5,991
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	2,164	2,122
Regulatory liabilities	3,011	2,959
Asset retirement obligations	776	768
Other deferred credits and liabilities	76	56
Total deferred credits and other liabilities	6,027	5,905
Commitments and Contingencies
Shareholders’ Equity:
Common Stock	511	511
Other paid-in capital, principally premium on common stock	2,725	2,725
Preferred stock	80	80
Retained earnings	3,672	3,647
Total shareholders’ equity	6,988	6,963
TOTAL LIABILITIES AND EQUITY	20,783	20,606
Union Electric Company | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	179	204
Current Liabilities:
Accounts and wages payable	311	618
Union Electric Company | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	47	72
Current Liabilities:
Accounts and wages payable	41	53
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	0	0
Unbilled revenue	132	156
Miscellaneous accounts receivable	17	44
Inventories	176	225
Current regulatory assets	223	252
Other current assets	42	62
Total current assets	917	1,047
Property, Plant, and Equipment, Net	14,779	14,632
Investments and Other Assets:
Goodwill	411	411
Regulatory assets	1,140	1,035
Pension and other postretirement benefits	400	394
Other assets	632	603
Total investments and other assets	2,583	2,443
TOTAL ASSETS	18,279	18,122
Current Liabilities:
Current maturities of long-term debt	300	0
Short-term debt	424	366
Borrowings from money pool	54	135
Customer deposits	152	141
Regulatory Liability, Current	56	71
Other current liabilities	280	298
Total current liabilities	1,610	1,433
Long-term Debt, Net	4,933	5,232
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	1,948	1,906
Regulatory liabilities	2,445	2,418
Other deferred credits and liabilities	303	308
Total deferred credits and other liabilities	4,696	4,632
Commitments and Contingencies
Shareholders’ Equity:
Common Stock	0	0
Other paid-in capital, principally premium on common stock	3,020	3,020
Preferred stock	49	49
Retained earnings	3,971	3,756
Total shareholders’ equity	7,040	6,825
TOTAL LIABILITIES AND EQUITY	18,279	18,122
Ameren Illinois Company | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	313	273
Current Liabilities:
Accounts and wages payable	260	370
Ameren Illinois Company | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	14	35
Current Liabilities:
Accounts and wages payable	$ 84	$ 52