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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Deferred income tax assets: |  |
Employee benefits | $ 114 | $ 136
Price risk management | 0 | 29
Deferred income taxes | 39 | 23
Deferred Tax Assets, tax credits, net of valuation allowance | 98 | 77
Total deferred income tax assets | 251 | 265
Deferred income tax liabilities: |  |
Depreciation and amortization | 536 | 504
Regulatory assets | 121 | 128
Deferred Tax Liabilities, Other | 7 | 7
Deferred Tax Liabilities, Gross, Noncurrent | 664 | 639
Total deferred income tax liabilities | $ 413 | $ 374

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