XML 79 R60.htm IDEA: XBRL DOCUMENT
v3.22.1

Commitments And Contingencies (Narrative) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($)
Commitments and Contingencies [Line Items] |
Minimum future commitments | $ 1,201
IPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 610
WPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 558
Capital Purchase Commitment [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 214
Capital Purchase Commitment [Member] | WPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 213
Indemnification Agreement [Member] |
Commitments and Contingencies [Line Items] |
Obligations, maximum | 67
Indemnification Agreement [Member] | Purchased Power [Member] |
Commitments and Contingencies [Line Items] |
Obligations, maximum | $ 17
Workforce Subject to Collective Bargaining Arrangements [Member] |
Commitments and Contingencies [Line Items] |
Employees covered by collective bargaining agreements | 55.00%
Workforce Subject to Collective Bargaining Arrangements [Member] | IPL [Member] |
Commitments and Contingencies [Line Items] |
Employees covered by collective bargaining agreements | 70.00%
Workforce Subject to Collective Bargaining Arrangements [Member] | WPL [Member] |
Commitments and Contingencies [Line Items] |
Employees covered by collective bargaining agreements | 83.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] |
Commitments and Contingencies [Line Items] |
Employees covered by collective bargaining agreements | 26.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member] | WPL [Member] |
Commitments and Contingencies [Line Items] |
Employees covered by collective bargaining agreements | 83.00%
Whiting Petroleum Affiliate [Member] |
Commitments and Contingencies [Line Items] |
Partnership share, percent | 6.00%
Obligations, maximum | $ 60
Credit loss liability | $ 5

X
- Definition Concentration Risk Threshold Percentage + References No definition available. + Details
Name: | lnt_ConcentrationRiskThresholdPercentage
Namespace Prefix: | lnt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=lnt_CapitalPurchaseObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=lnt_PurchasedPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=lnt_WhitingPetroleumCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |