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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deferred income tax assets: |  |
Employee benefits | $ 99 | $ 99
Deferred income taxes | 21 | 75
Deferred Tax Assets, tax credits, net of valuation allowance | 73 | 102
Deferred Tax Assets, Derivative Instruments | 57 | 0
Total deferred income tax assets | 250 | 276
Deferred income tax liabilities: |  |
Depreciation and amortization | 578 | 547
Deferred Tax Liabilities, Derivatives | 0 | 54
Regulatory assets | 146 | 101
Deferred Tax Liabilities, Other | 14 | 13
Deferred Tax Liabilities, Gross, Noncurrent | 738 | 715
Total deferred income tax liabilities | $ 488 | $ 439

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