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Receivables (Maximum And Average Outstanding Cash Proceeds) (Details) - IPL [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Maximum [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances) | $ 66 | $ 110 | $ 66 | $ 110
Average [Member] |  |  |  |
Receivables [Line Items] |  |  |  |
Average outstanding aggregate cash proceeds (based on daily outstanding balances) | $ 18 | $ 61 | $ 11 | $ 46

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- Definition Average Proceeds From Sale and Collection of Receivables During The Period + References No definition available. + Details
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Namespace Prefix: | lnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The cash inflow associated with the proceeds from sale and collection of receivables during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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- Details
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