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Debt (Schedule Of Debt Maturities) (Details) $ in Millions | Dec. 31, 2021 USD ($)
--- | ---
2022 | $ 633
2023 | 408
2024 | 509
2025 | 300
2026 | 200
IPL [Member] |
2022 | 0
2023 | 0
2024 | 500
2025 | 300
2026 | 0
WPL [Member] |
2022 | 250
2023 | 0
2024 | 0
2025 | 0
2026 | 0
Corporate Services [Member] |
2022 | 75
2023 | 0
2024 | 0
2025 | 0
2026 | 0
Alliant Energy Finance, LLC [Member] |
2022 | 308
2023 | 408
2024 | 9
2025 | 0
2026 | $ 200

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