Consolidated Balance Sheet - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 8	$ 10
Accounts receivable - trade (less allowance for doubtful accounts)	597	600
Unbilled revenue	360	446
Miscellaneous accounts receivable	65	54
Inventories	760	667
Current regulatory assets	157	354
Investment in industrial development revenue bonds	0	240
Current collateral assets	13	142
Other current assets	124	155
Total current assets	2,084	2,668
Property, Plant, and Equipment, Net	32,938	31,262
Investments and Other Assets:
Nuclear decommissioning trust fund	1,042	958
Goodwill	411	411
Regulatory assets	1,772	1,426
Pension and other postretirement benefits	470	411
Other assets	882	768
Total investments and other assets	4,577	3,974
TOTAL ASSETS	39,599	37,904
Current Liabilities:
Current maturities of long-term debt	849	340
Short-term debt	1,340	1,070
Accounts and wages payable	955	1,159
Taxes accrued	209	59
Other current liabilities	664	738
Total current liabilities	4,017	3,366
Long-term Debt, Net	13,829	13,685
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	4,068	3,804
Regulatory liabilities	5,336	5,309
Asset retirement obligations	761	763
Other deferred credits and liabilities	416	340
Total deferred credits and other liabilities	10,581	10,216
Commitments and Contingencies
Shareholders’ Equity:
Common Stock	3	3
Other paid-in capital, principally premium on common stock	6,900	6,860
Retained earnings	4,144	3,646
Accumulated other comprehensive loss	(4)	(1)
Total shareholders’ equity	11,043	10,508
Noncontrolling Interests	129	129
Total equity	11,172	10,637
TOTAL LIABILITIES AND EQUITY	39,599	37,904
Union Electric Company
Current Assets:
Cash and cash equivalents	3	0
Unbilled revenue	240	184
Miscellaneous accounts receivable	24	18
Inventories	512	434
Current regulatory assets	91	254
Investment in industrial development revenue bonds	0	240
Current collateral assets	12	101
Other current assets	41	66
Total current assets	1,228	1,592
Property, Plant, and Equipment, Net	16,797	16,124
Investments and Other Assets:
Nuclear decommissioning trust fund	1,042	958
Regulatory assets	700	594
Pension and other postretirement benefits	120	98
Other assets	137	140
Total investments and other assets	1,999	1,790
TOTAL ASSETS	20,024	19,506
Current Liabilities:
Current maturities of long-term debt	350	240
Short-term debt	157	329
Taxes accrued	181	29
Other current liabilities	213	323
Total current liabilities	1,382	1,570
Long-term Debt, Net	5,991	5,846
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	2,018	1,982
Regulatory liabilities	2,851	2,871
Asset retirement obligations	757	759
Other deferred credits and liabilities	57	51
Total deferred credits and other liabilities	5,683	5,663
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	3,652	3,111
Total shareholders’ equity	6,968	6,427
TOTAL LIABILITIES AND EQUITY	20,024	19,506
Union Electric Company | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	289	244
Current Liabilities:
Accounts and wages payable	396	606
Union Electric Company | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	16	51
Current Liabilities:
Accounts and wages payable	85	43
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	0	0
Unbilled revenue	120	262
Miscellaneous accounts receivable	29	23
Inventories	248	233
Current regulatory assets	63	87
Other current assets	46	98
Total current assets	811	1,056
Property, Plant, and Equipment, Net	14,271	13,353
Investments and Other Assets:
Goodwill	411	411
Regulatory assets	1,046	821
Pension and other postretirement benefits	341	318
Other assets	565	482
Total investments and other assets	2,363	2,032
TOTAL ASSETS	17,445	16,441
Current Liabilities:
Current maturities of long-term debt	0	100
Short-term debt	59	264
Customer deposits	132	87
Regulatory Liability, Current	53	64
Other current liabilities	242	232
Total current liabilities	1,042	1,291
Long-term Debt, Net	5,231	4,735
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and tax credits, net	1,845	1,699
Regulatory liabilities	2,353	2,313
Other deferred credits and liabilities	304	235
Total deferred credits and other liabilities	4,502	4,247
Commitments and Contingencies
Shareholders’ Equity:
Common Stock	0	0
Other paid-in capital, principally premium on common stock	2,979	2,929
Preferred stock	49	49
Retained earnings	3,642	3,190
Total shareholders’ equity	6,670	6,168
TOTAL LIABILITIES AND EQUITY	17,445	16,441
Ameren Illinois Company | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	294	341
Current Liabilities:
Accounts and wages payable	420	451
Ameren Illinois Company | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	11	12
Current Liabilities:
Accounts and wages payable	$ 136	$ 93