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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 561 | $ 611
Regulatory Asset, Noncurrent |  | 2,849 | 2,798
Regulatory assets not currently earning a return |  | 892 | 1,085
Pension and retiree medical obligations |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 39 | 27
Regulatory Asset, Noncurrent |  | 1,167 | 1,106
Recoverable deferred taxes on AFUDC recorded in plant |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 0 | 0
Regulatory Asset, Noncurrent |  | 368 | 332
Net AROs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 0 | 0
Regulatory Asset, Noncurrent |  | 387 | 316
Excess deferred taxes - TCJA |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 10 | 10
Regulatory Asset, Noncurrent |  | 184 | 198
Depreciation differences |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 17 | 17
Regulatory Asset, Noncurrent |  | 250 | 189
Environmental remediation costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 13 | 15
Regulatory Asset, Noncurrent |  | 39 | 94
Deferred purchased natural gas and electric energy costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 99 | 239
Regulatory Asset, Noncurrent |  | $ 25 | 80
Deferred purchased natural gas and electric energy costs | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |
Deferred purchased natural gas and electric energy costs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |
Conservation programs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current | [1] | $ 20 | 19
Regulatory Asset, Noncurrent | [1] | $ 30 | 54
Conservation programs | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |
Conservation programs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |
Purchased power contract costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 5 | 4
Regulatory Asset, Noncurrent |  | 28 | 40
PI extended power update |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 4 | 4
Regulatory Asset, Noncurrent |  | $ 34 | 38
Regulatory Asset, Remaining Amortization Period |  | 10 years |
Benson Biomass PPA termination and asset purchase |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 10 | 10
Regulatory Asset, Noncurrent |  | $ 26 | 36
Regulatory Asset, Remaining Amortization Period |  | 4 years |
Sales true-up and revenue decoupling |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 60 | 7
Regulatory Asset, Noncurrent |  | 23 | 33
MISO capacity revenue tracker |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | 63 | 36
Regulatory Asset, Noncurrent |  | $ 45 | 26
MISO capacity revenue tracker | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |
MISO capacity revenue tracker | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |
Gas pipeline inspection and remediation costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 47 | 40
Regulatory Asset, Noncurrent |  | $ 9 | 25
Gas pipeline inspection and remediation costs | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Liability, Amortization Period |  | 1 year |
Gas pipeline inspection and remediation costs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Liability, Amortization Period |  | 2 years |
Nuclear refueling outage costs |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 51 | 43
Regulatory Asset, Noncurrent |  | $ 20 | 19
Nuclear refueling outage costs | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |
Nuclear refueling outage costs | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |
Renewable resources and environmental initiatives |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 34 | 38
Regulatory Asset, Noncurrent |  | $ 4 | 5
Renewable resources and environmental initiatives | Minimum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |
Renewable resources and environmental initiatives | Maximum |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |
Other |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory Asset, Current |  | $ 89 | 102
Regulatory Asset, Noncurrent |  | $ 210 | $ 207
[1] | Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

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- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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