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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 |
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Dec. 31, 2022 | Dec. 31, 2021
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
Union Electric Company |  |
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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | $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 |
Union Electric Company | 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 Illinois Company |  |
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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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 Company | 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% |
Ameren Illinois Company | 7.75% Series |  |
Long-Term Debt And Equity Financings [Line Items] |  |
Dividend rate on preferred shares, percentage | 7.75% |
Ameren Illinois Company | 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 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21484-112644 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21488-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21564-112644 + Details
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