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Long-Term Debt And Equity Financings (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-Term Debt And Equity Financings [Abstract] |
Schedule of Long-term Debt Instruments | The following table presents long-term debt outstanding, including maturities due within one year, as of December 31, 2023 and 2022:
| 2023 |  | 2022
Ameren (Parent): |  |  |
2.50% Senior unsecured notes due 2024 | $ | 450 |  |  | $ | 450 |
3.65% Senior unsecured notes due 2026 | 350 |  |  | 350 |
5.70% Senior unsecured notes due 2026 | 600 |  |  | — |
1.95% Senior unsecured notes due 2027 | 500 |  |  | 500 |
1.75% Senior unsecured notes due 2028 | 450 |  |  | 450 |
5.00% Senior unsecured notes due 2029 | 700 |  |  | — |
3.50% Senior unsecured notes due 2031 | 800 |  |  | 800 |
Total long-term debt, gross | 3,850 |  |  | 2,550 |
Less: Unamortized discount and premium | (4) |  |  | (2) |
Less: Unamortized debt issuance costs | (17) |  |  | (12) |
Less: Maturities due within one year | (450) |  |  | — |
Long-term debt, net | $ | 3,379 |  |  | $ | 2,536 |
Ameren Missouri: |  |  |
Bonds and notes: |  |  |
3.50% Senior secured notes due 2024(a) | $ | 350 |  |  | $ | 350 |
2.95% Senior secured notes due 2027(a) | 400 |  |  | 400 |
3.50% First mortgage bonds due 2029(b) | 450 |  |  | 450 |
2.95% First mortgage bonds due 2030(b) | 465 |  |  | 465 |
2.15% First mortgage bonds due 2032(b) | 525 |  |  | 525 |
2.90% 1998 Series A bonds due 2033(c) | 60 |  |  | 60 |
2.90% 1998 Series B bonds due 2033(c) | 50 |  |  | 50 |
2.75% 1998 Series C bonds due 2033(c) | 50 |  |  | 50 |
5.50% Senior secured notes due 2034(a) | 184 |  |  | 184 |
5.30% Senior secured notes due 2037(a) | 300 |  |  | 300 |
8.45% Senior secured notes due 2039(a)(d) | 350 |  |  | 350 |
3.90% Senior secured notes due 2042(a)(d) | 485 |  |  | 485 |
3.65% Senior secured notes due 2045(a) | 400 |  |  | 400 |
4.00% First mortgage bonds due 2048(b) | 425 |  |  | 425 |
3.25% First mortgage bonds due 2049(b) | 330 |  |  | 330 |
2.625% First mortgage bonds due 2051(b) | 550 |  |  | 550 |
3.90% First mortgage bonds due 2052(b) | 525 |  |  | 525 |
5.45% First mortgage bonds due 2053(b) | 500 |  |  | — |
Finance obligations: |  |  |
Audrain County agreement (Audrain County CT) due 2023(e) | — |  |  | 240 |
Total long-term debt, gross | 6,399 |  |  | 6,139 |
Less: Unamortized discount and premium | (13) |  |  | (12) |
Less: Unamortized debt issuance costs | (45) |  |  | (41) |
Less: Maturities due within one year | (350) |  |  | (240) |
Long-term debt, net | $ | 5,991 |  |  | $ | 5,846 |
| 2023 |  | 2022
Ameren Illinois: |  |  |
Bonds and notes: |  |  |
0.375% First mortgage bonds due 2023(f) | $ | — |  |  | $ | 100 |
3.25% Senior secured notes due 2025(g) | 300 |  |  | 300 |
6.125% Senior secured notes due 2028(g) | 60 |  |  | 60 |
3.80% First mortgage bonds due 2028(f) | 430 |  |  | 430 |
1.55% First mortgage bonds due 2030(f) | 375 |  |  | 375 |
3.85% First mortgage bonds due 2032(f) | 500 |  |  | 500 |
4.95% First mortgage bonds due 2033(f) | 500 |  |  | — |
6.70% Senior secured notes due 2036(g) | 61 |  |  | 61 |
6.70% Senior secured notes due 2036(g) | 42 |  |  | 42 |
4.80% Senior secured notes due 2043(g) | 280 |  |  | 280 |
4.30% Senior secured notes due 2044(g) | 250 |  |  | 250 |
4.15% Senior secured notes due 2046(g) | 490 |  |  | 490 |
3.70% First mortgage bonds due 2047(f) | 500 |  |  | 500 |
4.50% First mortgage bonds due 2049(f) | 500 |  |  | 500 |
3.25% First mortgage bonds due 2050(f) | 300 |  |  | 300 |
2.90% First mortgage bonds due 2051(f) | 350 |  |  | 350 |
5.90% First mortgage bonds due 2052(f) | 350 |  |  | 350 |
Total long-term debt, gross | 5,288 |  |  | 4,888 |
Less: Unamortized discount and premium | (9) |  |  | (9) |
Less: Unamortized debt issuance costs | (47) |  |  | (44) |
Less: Maturities due within one year | — |  |  | (100) |
Long-term debt, net | $ | 5,232 |  |  | $ | 4,735 |
ATXI: |  |  |
2.45% Senior unsecured notes due 2036(h) | $ | 75 |  |  | $ | 75 |
3.43% Senior unsecured notes due 2050(i) | 400 |  |  | 400 |
2.96% Senior unsecured notes due 2052(j) | 95 |  |  | 95 |
Total long-term debt, gross | 570 |  |  | 570 |
Less: Unamortized debt issuance costs | (2) |  |  | (2) |
Less: Maturities due within one year | (49) |  |  | — |
Long-term debt, net | $ | 519 |  |  | $ | 568 |
Ameren consolidated long-term debt, net | $ | 15,121 |  |  | $ | 13,685 |
(a)These notes are collaterally secured by first mortgage bonds issued by Ameren Missouri under the Ameren Missouri mortgage indenture. The notes have a fall-away lien provision and will remain secured only as long as any first mortgage bonds issued under the Ameren Missouri mortgage indenture remain outstanding. Redemption, purchase, or maturity of all first mortgage bonds, including first mortgage bonds currently outstanding and any that may be issued in the future, would result in a release of the first mortgage bonds currently securing these notes, at which time these notes would become unsecured obligations. Considering the 2053 maturity of the 5.45% first mortgage bonds and the restrictions preventing a release date to occur that are attached to certain senior secured notes described in footnote (d) below, Ameren Missouri does not expect the first mortgage lien protection associated with these notes to fall away. (b)These bonds are first mortgage bonds issued by Ameren Missouri under the Ameren Missouri bond indenture. They are secured by substantially all Ameren Missouri property and franchises. (c)These bonds are collaterally secured by first mortgage bonds issued by Ameren Missouri under the Ameren Missouri mortgage indenture and have a fall-away lien provision similar to that of Ameren Missouri’s senior secured notes. (d)Ameren Missouri has agreed that so long as any of the 3.90% senior secured notes due 2042 are outstanding, Ameren Missouri will not permit a release date to occur, and so long as any of the 8.45% senior secured notes due 2039 are outstanding, Ameren Missouri will not optionally redeem, purchase, or otherwise retire in full the outstanding first mortgage bonds not subject to release provisions. (e)No cash was exchanged associated with the termination of the Audrain County agreement as the $240 million principal amount of the financing obligation due from Ameren Missouri was equal to the amount of bond service payments due to Ameren Missouri. The balance of the financing obligation and the related investment in debt securities was $240 million as of December 31, 2022. The investment was recorded in “Investments in industrial development revenue bonds” as of December 31, 2022. See below for additional information on this financing obligation. (f)These bonds are first mortgage bonds issued by Ameren Illinois under the Ameren Illinois mortgage indenture. They are secured by substantially all Ameren Illinois property and franchises. (g)These notes are collaterally secured by first mortgage bonds issued by Ameren Illinois under the Ameren Illinois mortgage indenture. The notes have a fall-away lien provision and will remain secured only as long as any first mortgage bonds issued under its mortgage indenture remain outstanding. Redemption, purchase, or maturity of all first mortgage bonds, including first mortgage bonds currently outstanding and any that may be issued in the future, would result in a release of the first mortgage bonds currently securing these notes, at which time these notes would become unsecured obligations. Considering the 2052 maturity date of the 5.90% first mortgage bonds, Ameren Illinois does not expect the first mortgage lien protection associated with these notes to fall away.
Schedule Of Maturities Of Long-Term Debt | The following table presents the principal maturities schedule for the 2.45% senior unsecured notes due 2036:
Payment Date |  | Principal Payment
November 2029 | $ | 30
November 2036 |  | 45
Total | $ | 75
(i)The following table presents the principal maturities schedule for the 3.43% senior unsecured notes due 2050:
Payment Date |  | Principal Payment
August 2024 | $ | 49
August 2027 |  | 50
August 2030 |  | 49
August 2032 |  | 50
August 2038 |  | 49
August 2043 |  | 77
August 2050 |  | 76
Total | $ | 400
(j)The following table presents the principal maturities schedule for the 2.96% senior unsecured notes due 2052:
Payment Date |  | Principal Payment
August 2040 | $ | 45
August 2052 |  | 50
Total | $ | 95
The following table presents the aggregate maturities of long-term debt, including current maturities, at December 31, 2023:
| Ameren (parent)(a) |  | Ameren Missouri(a) |  | Ameren Illinois(a) |  | ATXI(a) |  | Ameren Consolidated(a)
2024 | $ | 450 |  |  | $ | 350 |  |  | $ | — |  |  | $ | 49 |  |  | $ | 849 |
2025 | — |  |  | — |  |  | 300 |  |  | — |  |  | 300 |
2026 | 950 |  |  | — |  |  | — |  |  | — |  |  | 950 |
2027 | 500 |  |  | 400 |  |  | — |  |  | 50 |  |  | 950 |
2028 | 450 |  |  | — |  |  | 490 |  |  | — |  |  | 940 |
Thereafter | 1,500 |  |  | 5,649 |  |  | 4,498 |  |  | 471 |  |  | 12,118 |
Total | $ | 3,850 |  |  | $ | 6,399 |  |  | $ | 5,288 |  |  | $ | 570 |  |  | $ | 16,107 |
(a)Excludes unamortized discount, premium, and debt issuance costs of $21 million, $58 million, $56 million, and $2 million at Ameren (parent), Ameren Missouri, Ameren Illinois, and ATXI, respectively.
Schedule Of Outstanding Preferred Stock | The following table presents the outstanding preferred stock of Ameren Missouri and Ameren Illinois, which is redeemable at the option of the issuer, at the prices shown below as of December 31, 2023 and 2022:
| Shares Outstanding |  | Redemption Price (per share) |  | 2023 |  | 2022
Ameren Missouri: |  |  |  |  |  |  |
Without par value and stated value of $100 per share, 25 million shares authorized |  |  |  |  |  |
$3.50 Series | 130,000 shares |  | $ | 110.00 |  |  | $ | 13 |  |  | $ | 13 |
$3.70 Series | 40,000 shares |  | 104.75 |  |  | 4 |  |  | 4 |
$4.00 Series | 150,000 shares |  | 105.625 |  |  | 15 |  |  | 15 |
$4.30 Series | 40,000 shares |  | 105.00 |  |  | 4 |  |  | 4 |
$4.50 Series | 213,595 shares |  | 110.00 |  | (a) | 21 |  |  | 21 |
$4.56 Series | 200,000 shares |  | 102.47 |  |  | 20 |  |  | 20 |
$4.75 Series | 20,000 shares |  | 102.176 |  |  | 2 |  |  | 2 |
$5.50 Series A | 14,000 shares |  | 110.00 |  |  | 1 |  |  | 1 |
Total |  |  |  | $ | 80 |  |  | $ | 80 |
Ameren Illinois: |  |  |  |  |  |  |
With par value of $100 per share, 2 million shares authorized |  |  |  |  |  |
4.00% Series | 144,275 shares |  | $ | 101.00 |  |  | $ | 14 |  |  | $ | 14 |
4.08% Series | 45,224 shares |  | 103.00 |  |  | 5 |  |  | 5 |
4.20% Series | 23,655 shares |  | 104.00 |  |  | 2 |  |  | 2 |
4.25% Series | 50,000 shares |  | 102.00 |  |  | 5 |  |  | 5 |
4.26% Series | 16,621 shares |  | 103.00 |  |  | 2 |  |  | 2 |
4.42% Series | 16,190 shares |  | 103.00 |  |  | 2 |  |  | 2 |
4.70% Series | 18,429 shares |  | 104.30 |  |  | 2 |  |  | 2 |
4.90% Series | 73,825 shares |  | 102.00 |  |  | 7 |  |  | 7 |
4.92% Series | 49,289 shares |  | 103.50 |  |  | 5 |  |  | 5 |
5.16% Series | 50,000 shares |  | 102.00 |  |  | 5 |  |  | 5 |
Total |  |  |  | $ | 49 |  |  | $ | 49 |
Total Ameren |  |  |  | $ | 129 |  |  | $ | 129 |
(a)In the event of voluntary liquidation, $105.50.
Schedule of Required and Actual Debt Ratios | The following table summarizes the required and actual interest coverage ratios for interest charges, dividend coverage ratios, and bonds and preferred stock issuable as of December 31, 2023, at an assumed interest rate of 7% and dividend rate of 8%.
| Required Interest Coverage Ratio(a) | Actual Interest Coverage Ratio | Bonds Issuable(b) |  | Required Dividend Coverage Ratio(c) | Actual Dividend Coverage Ratio | Preferred Stock Issuable |
Ameren Missouri | >2.0 | 3.3 | $4,209 |  | >2.5 | 160.5 | $2,701 |
Ameren Illinois | >2.0 | 6.9 | 8,517 |  | >1.5 | 3.8 | 203 | (d)
(a)Coverage required on the annual interest charges on first mortgage bonds outstanding and to be issued. Coverage is not required in certain cases when additional first mortgage bonds are issued on the basis of retired bonds. (b)Amount of bonds issuable based either on required coverage ratios or unfunded property additions, whichever is more restrictive. The amounts shown also include bonds issuable based on retired bond capacity of $1,959 million and $1,143 million at Ameren Missouri and Ameren Illinois, respectively. (c)Coverage required on the annual dividend on preferred stock outstanding and to be issued, as required in the respective company’s articles of incorporation. (d)Preferred stock issuable is restricted by the amount of preferred stock that is currently authorized by Ameren Illinois’ articles of incorporation.

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