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Regulatory Assets and Liabilities, Regulatory Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | $ 611 | $ 1,059 | [1]
Regulatory Asset, Noncurrent |  | 2,798 | 2,871 | [1]
Regulatory assets not currently earning a return |  | 1,085 | 1,020 |
Pension and retiree medical obligations |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 27 | 22 | [1]
Regulatory Asset, Noncurrent |  | 1,106 | 1,069 | [1]
Recoverable deferred taxes on AFUDC recorded in plant |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 0 | 0 | [1]
Regulatory Asset, Noncurrent |  | 332 | 292 | [1]
Net AROs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current | [2] | 0 | 0 | [1]
Regulatory Asset, Noncurrent | [2] | 316 | 339 | [1]
Excess deferred taxes - TCJA |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 10 | 13 | [1]
Regulatory Asset, Noncurrent |  | 198 | 205 | [1]
Depreciation differences |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 17 | 17 | [1]
Regulatory Asset, Noncurrent |  | $ 189 | 193 | [1]
Depreciation differences | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |  |
Depreciation differences | Maximum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 12 years |  |
Environmental remediation costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | $ 15 | 20 | [1]
Regulatory Asset, Noncurrent |  | 94 | 92 | [1]
Deferred purchased natural gas and electric energy costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 239 | 581 | [1]
Regulatory Asset, Noncurrent |  | $ 80 | 299 | [1]
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 |  | 3 years |  |
Conservation programs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current | [3] | $ 19 | 16 | [1]
Regulatory Asset, Noncurrent | [3] | $ 54 | 36 | [1]
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 |  | $ 4 | 10 | [1]
Regulatory Asset, Noncurrent |  | 40 | 36 | [1]
PI extended power update |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 4 | 4 | [1]
Regulatory Asset, Noncurrent |  | $ 38 | 42 | [1]
Regulatory Asset, Remaining Amortization Period |  | 11 years |  |
Benson Biomass PPA termination and asset purchase |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | $ 10 | 10 | [1]
Regulatory Asset, Noncurrent |  | $ 36 | 45 | [1]
Regulatory Asset, Remaining Amortization Period |  | 5 years |  |
Sales true-up and revenue decoupling |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | $ 7 | 54 | [1]
Regulatory Asset, Noncurrent |  | 33 | 0 | [1]
State commission adjustments |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 1 | 1 | [1]
Regulatory Asset, Noncurrent |  | 32 | 33 | [1]
Losses on reacquired debt |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 2 | 3 | [1]
Regulatory Asset, Noncurrent |  | 30 | 32 | [1]
MISO capacity revenue tracker |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 36 | 0 | [1]
Regulatory Asset, Noncurrent |  | $ 26 | 0 | [1]
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 |  | $ 40 | 42 | [1]
Regulatory Asset, Noncurrent |  | $ 25 | 13 | [1]
Gas pipeline inspection and remediation costs | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |  |
Gas pipeline inspection and remediation costs | Maximum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 2 years |  |
Contract valuation adjustments |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current | [4] | $ 18 | 28 | [1]
Regulatory Asset, Noncurrent | [4] | 22 | 28 | [1]
Nuclear refueling outage costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | 43 | 30 | [1]
Regulatory Asset, Noncurrent |  | $ 19 | 12 | [1]
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 |  |
Grid modernization costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Current |  | $ 16 | 14 | [1]
Regulatory Asset, Noncurrent |  | $ 17 | 24 | [1]
Grid modernization costs | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |  |
Grid modernization 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 |  | $ 38 | 50 | [1]
Regulatory Asset, Noncurrent |  | $ 5 | 6 | [1]
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 |  | $ 65 | 144 | [1]
Regulatory Asset, Noncurrent |  | $ 106 | $ 75 | [1]
Texas revenue surcharges | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory Asset, Remaining Amortization Period |  | 1 year |  |
[1] | Prior period amounts have been reclassified to conform with current year presentation.
[2] | The 2022 amount is net of the nuclear decommissioning accruals and gains from decommissioning investments. In 2023, the nuclear decommissioning accruals and gains from decommissioning investments exceeded the expected cost of AROs in NSP-Minnesota and was reclassified to a regulatory liability.
[3] | Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.
[4] | Includes the fair value of certain long-term PPAs used to meet energy capacity requirements and valuation adjustments on natural gas commodity purchases.

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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//1943274/2147481878/980-340-50-1 + Details
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