Consolidated Balance Sheet - UE - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 25	$ 10
Accounts receivable - trade (less allowance for doubtful accounts)	494	600
Unbilled revenue	319	446
Advances to money pool	106	54
Inventories	733	667
Current regulatory assets	365	354
Investments in Industrial Development Revenue Bonds	0
Current collateral assets	14	142
Other current assets	125	155
Total current assets	2,181	2,668
Property, Plant, and Equipment, Net	33,776	31,262
Investments and Other Assets:
Nuclear decommissioning trust fund	1,150	958
Regulatory assets	1,810	1,426
Pension and other postretirement benefits	581	411
Other assets	921	768
Total investments and other assets	4,873	3,974
TOTAL ASSETS	40,830	37,904
Current Liabilities:
Current maturities of long-term debt	849	340
Short-term debt	536	1,070
Accounts and wages payable	1,136	1,159
Other current liabilities	648	682
Total current liabilities	3,345	3,366
Long-term Debt, Net	15,121	13,685
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and investment tax credits, net	4,176	3,804
Regulatory liabilities	5,512	5,309
Asset retirement obligations	772	763
Other deferred credits and liabilities	426	340
Total deferred credits and other liabilities	10,886	10,216
Commitments and Contingencies (Notes 2, 9, and 14)
Shareholders' Equity:
Common stock	3	3
Other paid-in capital, principally premium on common stock	7,216	6,860
Retained earnings	4,136	3,646
Total shareholders' equity	11,349	10,508
TOTAL LIABILITIES AND EQUITY	40,830	37,904
Ameren Missouri
Current Assets:
Cash and cash equivalents	0	0
Unbilled revenue	163	184
Advances to money pool	26	18
Inventories	508	434
Current regulatory assets	101	254
Investments in Industrial Development Revenue Bonds	0	240
Current collateral assets	5	101
Other current assets	63	66
Total current assets	1,142	1,592
Property, Plant, and Equipment, Net	17,250	16,124
Investments and Other Assets:
Nuclear decommissioning trust fund	1,150	958
Regulatory assets	755	594
Pension and other postretirement benefits	157	98
Other assets	152	140
Total investments and other assets	2,214	1,790
TOTAL ASSETS	20,606	19,506
Current Liabilities:
Current maturities of long-term debt	350	240
Short-term debt	170	329
Other current liabilities	250	352
Total current liabilities	1,747	1,570
Long-term Debt, Net	5,991	5,846
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and investment tax credits, net	2,122	1,982
Regulatory liabilities	2,959	2,871
Asset retirement obligations	768	759
Other deferred credits and liabilities	56	51
Total deferred credits and other liabilities	5,905	5,663
Commitments and Contingencies (Notes 2, 9, and 14)
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	3,647	3,111
Total shareholders' equity	6,963	6,427
TOTAL LIABILITIES AND EQUITY	20,606	19,506
Ameren Missouri | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	204	244
Current Liabilities:
Short-term debt	170	329
Accounts and wages payable	618	606
Ameren Missouri | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	72	51
Current Liabilities:
Short-term debt	306	0
Accounts and wages payable	53	43
Ameren Illinois
Current Assets:
Cash and cash equivalents	0	0
Unbilled revenue	156	262
Advances to money pool	44	23
Inventories	225	233
Current regulatory assets	252	87
Other current assets	62	98
Total current assets	1,047	1,056
Property, Plant, and Equipment, Net	14,632	13,353
Investments and Other Assets:
Regulatory assets	1,035	821
Pension and other postretirement benefits	394	318
Other assets	603	482
Total investments and other assets	2,443	2,032
TOTAL ASSETS	18,122	16,441
Current Liabilities:
Current maturities of long-term debt	0	100
Short-term debt	366	264
Other current liabilities	298	232
Total current liabilities	1,433	1,291
Long-term Debt, Net	5,232	4,735
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes and investment tax credits, net	1,906	1,699
Regulatory liabilities	2,418	2,313
Other deferred credits and liabilities	308	235
Total deferred credits and other liabilities	4,632	4,247
Commitments and Contingencies (Notes 2, 9, and 14)
Shareholders' Equity:
Common stock	0	0
Other paid-in capital, principally premium on common stock	3,020	2,929
Preferred stock	49	49
Retained earnings	3,756	3,190
Total shareholders' equity	6,825	6,168
TOTAL LIABILITIES AND EQUITY	18,122	16,441
Ameren Illinois | Nonrelated Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	273	341
Current Liabilities:
Short-term debt	366	264
Accounts and wages payable	370	451
Ameren Illinois | Related Party
Current Assets:
Accounts receivable - trade (less allowance for doubtful accounts)	35	12
Current Liabilities:
Short-term debt	135	0
Accounts and wages payable	$ 52	$ 93