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Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |
Employee benefits | $ 119 | $ 134
Price risk management | 26 | 36
Deferred income taxes | 22 | 26
Deferred Tax Assets, tax credits, net of valuation allowance | 64 | 52
Deferred Tax Assets, Tax Deferred Expense, Other | 0 | 9
Total deferred income tax assets | 231 | 257
Deferred income tax liabilities: |  |
Depreciation and amortization | 496 | 511
Regulatory assets | 103 | 115
Deferred Tax Liabilities, Other | 10 | 0
Deferred Tax Liabilities, Gross, Noncurrent | 609 | 626
Total deferred income tax liabilities | $ 378 | $ 369

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