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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Employee benefits | $ 136 | $ 119
Price risk management | 29 | 26
Deferred income taxes | 23 | 22
Deferred Tax Assets, tax credits, net of valuation allowance | 77 | 64
Total deferred income tax assets | 265 | 231
Deferred income tax liabilities: |  |
Depreciation and amortization | 504 | 496
Regulatory assets | 128 | 103
Deferred Tax Liabilities, Other | 7 | 10
Deferred Tax Liabilities, Gross, Noncurrent | 639 | 609
Total deferred income tax liabilities | $ 374 | $ 378

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