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Summary Of Significant Accounting Policies (Policy)
 9 Months Ended
Sep. 30, 2024
General, Basis of Accounting The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the 2023 Form 10-K.
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2024 are not necessarily indicative of results that may be expected for the year ending December 31, 2024.
General, Use of Estimates A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred.
General, Reclassification Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes.
Cash and Cash Equivalents At September 30, 2024, cash and cash equivalents included time deposits and money market fund investments of $803 million and $745 million for Alliant Energy and IPL, respectively, and money market fund investments of $58 million for WPL, with weighted average interest rates of 5%.
IPL [Member]  
General, Basis of Accounting The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the 2023 Form 10-K.
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2024 are not necessarily indicative of results that may be expected for the year ending December 31, 2024.
General, Use of Estimates A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred.
General, Reclassification Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes.
Cash and Cash Equivalents At September 30, 2024, cash and cash equivalents included time deposits and money market fund investments of $803 million and $745 million for Alliant Energy and IPL, respectively, and money market fund investments of $58 million for WPL, with weighted average interest rates of 5%.
WPL [Member]  
General, Basis of Accounting The interim unaudited Financial Statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, although management believes that the disclosures are adequate to make the information presented not misleading. These Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the 2023 Form 10-K.
In the opinion of management, all adjustments, which unless otherwise noted are normal and recurring in nature, necessary for a fair presentation of the results of operations, financial position and cash flows have been made. Results for the nine months ended September 30, 2024 are not necessarily indicative of results that may be expected for the year ending December 31, 2024.
General, Use of Estimates A change in management’s estimates or assumptions could have a material impact on financial condition and results of operations during the period in which such change occurred.
General, Reclassification Certain prior period amounts in the Financial Statements and Notes have been reclassified to conform to the current period presentation for comparative purposes.
Cash and Cash Equivalents At September 30, 2024, cash and cash equivalents included time deposits and money market fund investments of $803 million and $745 million for Alliant Energy and IPL, respectively, and money market fund investments of $58 million for WPL, with weighted average interest rates of 5%.