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Schedule I - Condensed Financial Information Of Parent (Statement of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 3,353	$ 2,763	$ 2,564
Cash Flows From Investing Activities:
Other	53	(26)	(1)
Net cash used in investing activities	(4,145)	(4,456)	(3,798)
Cash flows from financing activities:
Dividends on common stock	(768)	(714)	(662)
Short-term debt, net	(499)	607	(533)
Maturities and extinguishment of long-term debt	(341)	(893)	(100)
Issuances of long-term debt	1,960	2,535	2,295
Issuances of common stock	574	273	346
Employee payroll taxes related to stock-based compensation	(13)	(8)	(20)
Debt issuance costs	(24)	(31)	(21)
Net cash provided by (used in) financing activities	884	1,749	1,290
Cash, cash equivalents, and restricted cash at beginning of year	328	272	216
Cash, cash equivalents, and restricted cash at end of year	420	328	272
Noncash Investing and Financing Items [Abstract]
Stock Issued		16
Ameren (parent)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	451	(65)	171
Cash Flows From Investing Activities:
Money pool advances, net	74		530
Money pool advances, net		(495)
Investments in subsidiaries	(51)	(557)	(109)
Investments in subsidiary debt securities	24	44	0
Other	62	1	5
Net cash used in investing activities	(87)	(105)	(634)
Cash flows from financing activities:
Dividends on common stock	(768)	(714)	(662)
Short-term debt, net	(899)	1,054	(475)
Maturities and extinguishment of long-term debt	0	(450)	0
Issuances of long-term debt	749	0	1,298
Issuances of common stock	574	273	346
Employee payroll taxes related to stock-based compensation	(13)	(8)	(20)
Debt issuance costs	(7)	(1)	(8)
Net cash provided by (used in) financing activities	(364)	154	479
Net change in cash, cash equivalents, and restricted cash	0	(16)	16
Cash, cash equivalents, and restricted cash at beginning of year	0	16	0
Cash, cash equivalents, and restricted cash at end of year	0	0	16
Cash dividends received from consolidated subsidiaries	550	140	173
Noncash Investing and Financing Items [Abstract]
Stock Issued	$ 25	$ 16	$ 40

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