CONSOLIDATED BALANCE SHEETS - I&M (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Common Stock – Shares Authorized (in shares)	600,000,000	600,000,000
Long-term Debt Due Within One Year – Nonaffiliated	$ 3,335.0	$ 2,490.5
INDIANA MICHIGAN POWER COMPANY
Common Stock – Shares Authorized (in shares)	2,500,000	2,500,000
Common Stock – Shares Outstanding (in shares)	1,400,000	1,400,000
Long-term Debt Due Within One Year – Nonaffiliated	$ 269.2	$ 83.7
INDIANA MICHIGAN POWER COMPANY | DCC Fuel
Long-term Debt Due Within One Year – Nonaffiliated	$ 79.0	$ 81.4