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Related Parties (Net Intercompany Payables) (Details) (Corporate Services Billings [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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IPL [Member] |  |
Related Party Transactions [Line Items] |  |
Net amounts due from (to) related party | $ (85)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = lnt_IplMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lnt_CorporateServiceBillingsMember | $ (84)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = lnt_IplMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lnt_CorporateServiceBillingsMember
WPL [Member] |  |
Related Party Transactions [Line Items] |  |
Net amounts due from (to) related party | $ (52)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = lnt_WplMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lnt_CorporateServiceBillingsMember | $ (58)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / dei_LegalEntityAxis = lnt_WplMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lnt_CorporateServiceBillingsMember

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- Definition Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration