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Income Taxes Other Income Tax Matters (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax [Line Items]      
Federal NOL carryforward $ 0 $ 20  
Tax Credit Carryforward, Amount 1,644 1,593  
State NOL carryforwards 11 1,022  
Valuation allowances for state NOL carryforwards (2) (3)  
state tax credit carryforward, net of federal detirment [1] 74 85  
valuation allowances for state credit carryforwards, net of federal benefit [2] (60) (62)  
Federal detriment $ 20 $ 23  
Federal statutory rate 21.00% 21.00% 21.00%
State income tax on pretax income, net of federal tax effect 4.90% 4.90% 5.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent [3] (28.10%) (27.40%) (23.40%)
Effective Income Tax Rate Reconciliation, Other Regulatory Items, Percent [4] (5.60%) (5.50%) (6.20%)
Other tax credits, net NOL & tax credit allowances (1.30%) (1.30%) (1.10%)
Other, net 0.10% (0.10%) 0.10%
Effective income tax rate (9.00%) (8.40%) (4.60%)
Total income tax benefit $ (146) $ (135) $ (70)
Deferred tax expense (benefit) excluding items below 129 (138) 148
Amortization and adjustments to deferred income taxes on income tax regulatory assets and liabilities (188) 8 (221)
Income Tax Expense (Benefit), Intraperiod Tax Allocation 0 (10) (6)
Deferred tax benefit (249) (140) (79)
Regulatory liabilities 1,264    
Tax Credit Carryforward, Valuation Allowance (10) 0  
Adjustments to deferred income taxes for wind production tax credit cash transfers [5] (190) 0 0
State and Local Jurisdiction [Member]      
Income Tax [Line Items]      
Federal Benefit   16  
income tax expense      
Income Tax [Line Items]      
Current federal tax expense 113 1 15
Current state tax expense (benefit) 16 3 (2)
Current change in unrecognized tax (benefit) expense (21) 5 1
Deferred federal tax benefit (331) (239) (183)
Deferred state tax expense 75 96 99
Deferred change in unrecognized tax expense 7 3 5
Deferred ITCs (5) (4) (5)
Total income tax benefit (146) (135) $ (70)
Net Deferred Tax Liablility [Member]      
Income Tax [Line Items]      
Tax Credit Carryforward, Amount 1,718 1,679 [6]  
Differences between book and tax bases of property 6,744 6,442 [6]  
Operating Lease Assets 327 325 [6]  
Regulatory Asset 538 484 [6]  
Deferred fuel costs 67 222 [6]  
Deferred tax liability - Pension expense 151 159 [6]  
Other 84 90 [6]  
Total deferred tax liabilities 7,911 7,722 [6]  
Regulatory Liability 730 718 [6]  
Operating Loss Carryforwards 0 57 [6]  
Tax Credit Carryforward, Valuation Allowance (70) (62) [6]  
other employee benefits 117 102 [6]  
Other 188 133 [6]  
Total deferred tax assets 3,026 2,966 [6]  
Net deferred tax liability 4,885 4,756 [6]  
Operating lease liabilities 327 325 [6]  
Deferred investment tax credits $ 16 $ 14 [6]  
[1] State tax credit carryforwards are net of federal detriment of $20 million and $23 million as of Dec. 31, 2023 and 2022, respectively.
[2] Valuation allowances for state tax credit carryforwards were net of federal benefit of $16 million as of Dec. 31, 2023 and 2022.
[3] Wind PTCs net of estimated transfer discount are credited to customers (reduction to revenue) and do not materially impact net income.
[4] Plant regulatory differences primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit are offset by corresponding revenue reductions
[5] Proceeds from tax credit transfers are included in cash received (paid) for income taxes in the consolidated statement of cash flows.
[6] Prior periods have been reclassified to conform to current year presentation