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Long-Term Debt And Equity Financings (Schedule Of Outstanding Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 |
Preferred stock, voluntary liquidation (in dollars per share) | $ 105.50 |
Preferred stock, par value (in dollars per share) | $ 0.01 |
Preferred stock, authorized (in shares) | 100,000,000 |
Union Electric Company and Ameren Illinois |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, issued (in shares) | $ 129 | $ 129
Ameren Missouri |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 |
Preferred stock, issued (in shares) | $ 80 | 80
Preferred stock, par value (in dollars per share) | $ 1 |
Preferred stock, authorized (in shares) | 7,500,000 |
Ameren Missouri | Par Value $100 |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, par value (in dollars per share) | $ 100 |
Preferred stock, authorized (in shares) | 25,000,000 |
Ameren Missouri | $3.50 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 130,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 110.00 |
Preferred stock, issued (in shares) | $ 13 | 13
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 3.50 |
Ameren Missouri | $3.70 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 40,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 104.75 |
Preferred stock, issued (in shares) | $ 4 | 4
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 3.70 |
Ameren Missouri | $4.00 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 150,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 105.625 |
Preferred stock, issued (in shares) | $ 15 | 15
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 4.00 |
Ameren Missouri | $4.30 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 40,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 105.00 |
Preferred stock, issued (in shares) | $ 4 | 4
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 4.30 |
Ameren Missouri | $4.50 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 213,595 |
Preferred stock, redemption price per share (in dollars per share) | $ 110.00 |
Preferred stock, issued (in shares) | $ 21 | 21
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 4.50 |
Ameren Missouri | $4.56 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 200,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 102.47 |
Preferred stock, issued (in shares) | $ 20 | 20
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 4.56 |
Ameren Missouri | $4.75 Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 20,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 102.176 |
Preferred stock, issued (in shares) | $ 2 | 2
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 4.75 |
Ameren Missouri | $5.50 Series A |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 14,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 110.00 |
Preferred stock, issued (in shares) | $ 1 | 1
Dividend rate on preferred shares, per-dollar amount (in dollars per share) | $ 5.50 |
Ameren Illinois |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 |
Preferred stock, issued (in shares) | $ 49 | 49
Preferred stock, par value (in dollars per share) | $ 0 |
Preferred stock, authorized (in shares) | 2,600,000 |
Ameren Illinois | Par Value $100 |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, par value (in dollars per share) | $ 100 |
Preferred stock, authorized (in shares) | 2,000,000 |
Ameren Illinois | 4.00% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 144,275 |
Preferred stock, redemption price per share (in dollars per share) | $ 101.00 |
Preferred stock, issued (in shares) | $ 14 | 14
Dividend rate on preferred shares, percentage | 4.00% |
Ameren Illinois | 4.08% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 45,224 |
Preferred stock, redemption price per share (in dollars per share) | $ 103.00 |
Preferred stock, issued (in shares) | $ 5 | 5
Dividend rate on preferred shares, percentage | 4.08% |
Ameren Illinois | 4.20% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 23,655 |
Preferred stock, redemption price per share (in dollars per share) | $ 104.00 |
Preferred stock, issued (in shares) | $ 2 | 2
Dividend rate on preferred shares, percentage | 4.20% |
Ameren Illinois | 4.25% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 50,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 102.00 |
Preferred stock, issued (in shares) | $ 5 | 5
Dividend rate on preferred shares, percentage | 4.25% |
Ameren Illinois | 4.26% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 16,621 |
Preferred stock, redemption price per share (in dollars per share) | $ 103.00 |
Preferred stock, issued (in shares) | $ 2 | 2
Dividend rate on preferred shares, percentage | 4.26% |
Ameren Illinois | 4.42% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 16,190 |
Preferred stock, redemption price per share (in dollars per share) | $ 103.00 |
Preferred stock, issued (in shares) | $ 2 | 2
Dividend rate on preferred shares, percentage | 4.42% |
Ameren Illinois | 4.70% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 18,429 |
Preferred stock, redemption price per share (in dollars per share) | $ 104.30 |
Preferred stock, issued (in shares) | $ 2 | 2
Dividend rate on preferred shares, percentage | 4.70% |
Ameren Illinois | 4.90% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 73,825 |
Preferred stock, redemption price per share (in dollars per share) | $ 102.00 |
Preferred stock, issued (in shares) | $ 7 | 7
Dividend rate on preferred shares, percentage | 0.049% |
Ameren Illinois | 4.92% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 49,289 |
Preferred stock, redemption price per share (in dollars per share) | $ 103.50 |
Preferred stock, issued (in shares) | $ 5 | 5
Dividend rate on preferred shares, percentage | 4.92% |
Ameren Illinois | 5.16% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 50,000 |
Preferred stock, redemption price per share (in dollars per share) | $ 102.00 |
Preferred stock, issued (in shares) | $ 5 | $ 5
Dividend rate on preferred shares, percentage | 5.16% |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-4 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 + Details
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