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Commitments And Contingencies (Narrative) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Commitments and Contingencies [Line Items] |
Minimum future commitments | $ 1,122
IPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 569
WPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 523
Capital Purchase Commitment [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 25
Capital Purchase Commitment [Member] | WPL [Member] |
Commitments and Contingencies [Line Items] |
Minimum future commitments | 22
Indemnification Agreement [Member] |
Commitments and Contingencies [Line Items] |
Obligations, maximum | 74
Indemnification Agreement [Member] | Purchased Power [Member] |
Commitments and Contingencies [Line Items] |
Obligations, maximum | $ 17
Whiting Petroleum Affiliate [Member] |
Commitments and Contingencies [Line Items] |
Partnership share, percent | 6.00%
Obligations, maximum | $ 68
Credit loss liability | $ 5

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
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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
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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
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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
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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
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Balance Type: |
Period Type: |