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Related Party Transactions | 3 Months Ended
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Mar. 31, 2025
Related Party Transactions [Abstract] |
RELATED PARTY TRANSACTIONS | RELATED-PARTY TRANSACTIONS In the ordinary course of business, Ameren Missouri and Ameren Illinois have engaged in, and may in the future engage in, affiliate transactions. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between Ameren’s subsidiaries are reported as affiliate transactions on their individual financial statements, but those transactions are eliminated in consolidation for Ameren’s consolidated financial statements. For a discussion of material related-party agreements and money pool agreements, see Note 13 – Related-party Transactions and Note 4 – Short-term Debt and Liquidity under Part II, Item 8, of the Form 10-K. Support Services Agreements Ameren Missouri and Ameren Illinois had long-term receivables included in “Other assets” from Ameren Services of $27 million and $30 million, respectively, as of March 31, 2025, and $29 million and $32 million, respectively, as of December 31, 2024, related to Ameren Services’ allocated portion of Ameren’s pension and postretirement benefit plans. Tax Allocation Agreement See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for a discussion of the tax allocation agreement. The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of March 31, 2025, and December 31, 2024:
| March 31, 2025 |  |  | December 31, 2024
| Ameren Missouri | Ameren Illinois |  |  | Ameren Missouri | Ameren Illinois
Income taxes payable to parent(a) | $ | — | $ | 32 |  |  | $ | — | $ | 32
Income taxes receivable from parent(b) | 29 | — |  |  | 28 | —
(a)Included in “Accounts payable – affiliates” on the balance sheet. (b)Included in “Accounts receivable – affiliates” on the balance sheet. Effects of Related-party Transactions on the Statement of Income The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2025 and 2024:
|  |  |  |  |  | Three Months
Agreement | Income Statement Line Item |  |  |  |  |  |  | Ameren Missouri |  | Ameren Illinois
Ameren Missouri power supply | Operating Revenues | 2025 |  |  |  |  | $ | (a) | $ | (a)
agreements with Ameren Illinois |  | 2024 |  |  |  |  |  | (b) |  | (a)
Ameren Missouri and Ameren Illinois | Operating Revenues | 2025 |  |  |  |  | $ | 7 |  | $ | (b)
rent and facility services |  | 2024 |  |  |  |  |  | 7 |  |  | (b)
Ameren Missouri and Ameren Illinois miscellaneous | Operating Revenues | 2025 |  |  |  |  | $ | (b) | $ | 2 |
support services |  | 2024 |  |  |  |  |  | (b) |  | 1 |
Total Operating Revenues |  | 2025 |  |  |  |  | $ | 7 |  | $ | 2 |
|  | 2024 |  |  |  |  |  | 7 |  |  | 1 |
Ameren Illinois power supply | Purchased Power | 2025 |  |  |  |  | $ | (a) | $ | (a)
agreements with Ameren Missouri |  | 2024 |  |  |  |  |  | (a) |  | (b)
Ameren Missouri and Ameren Illinois | Purchased Power | 2025 |  |  |  |  | $ | 3 |  | $ | (b)
transmission services from ATXI |  | 2024 |  |  |  |  |  | 2 |  |  | (b)
Total Purchased Power |  | 2025 |  |  |  |  | $ | 3 |  | $ | (b)
|  | 2024 |  |  |  |  |  | 2 |  |  | (b)
Ameren Missouri and Ameren Illinois | Other Operations and Maintenance | 2025 |  |  |  |  | $ | (b) | $ | 1 |
rent and facility services |  | 2024 |  |  |  |  |  | (b) |  | (b)
Ameren Services support services | Other Operations and Maintenance | 2025 |  |  |  |  | $ | 44 |  | $ | 40 |
agreement |  | 2024 |  |  |  |  |  | 38 |  |  | 37 |
Total Other Operations and |  | 2025 |  |  |  |  | $ | 44 |  | $ | 41 |
Maintenance |  | 2024 |  |  |  |  |  | 38 |  |  | 37 |
Money pool interest | (Interest Charges)/Other Income, Net | 2025 |  |  |  |  | $ | (b) | $ | (b)
|  | 2024 |  |  |  |  |  | (3) |  |  | (2) |
Long-term debt, net - related parties | (Interest Charges) | 2025 |  |  |  |  |  | (b) |  | (b)
|  | 2024 |  |  |  |  |  | — |  |  | — |
(a)Not applicable. (b)Amount less than $1 million.

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480990/946-20-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477968/946-235-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477968/946-235-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(g)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(2)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/850/tableOfContent Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-6 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
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