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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.