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Debt (Schedule Of Debt Maturities) (Details) $ in Millions | Dec. 31, 2024 USD ($)
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2025 | $ 600
2026 | 775
2027 | 675
2028 | 800
2029 | 950
Parent Company [Member] |
2025 | 0
2026 | 575
2027 | 0
2028 | 0
2029 | 0
IPL [Member] |
2025 | 300
2026 | 0
2027 | 0
2028 | 500
2029 | 300
WPL [Member] |
2025 | 0
2026 | 0
2027 | 300
2028 | 0
2029 | 350
Alliant Energy Finance, LLC [Member] |
2025 | 300
2026 | 200
2027 | 375
2028 | 300
2029 | $ 300

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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
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