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Commitments and Contingent Liabilities Contingent Debt (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Indirect Guarantee of Indebtedness [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 217 | $ 330
Number of equity investees subject to contingent obligation | 3 | 3
Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Percentage of Debt Guaranteed | 100.00% | 100.00%
Long-term Debt | Indirect Guarantee of Indebtedness [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 122 | $ 128

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