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Commitments and Contingent Liabilities Contingent Debt (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Indirect Guarantee of Indebtedness [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 330 | $ 714
Number of equity investees subject to contingent obligation | 3 | 4
Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Percentage of Debt Guaranteed | 100.00% | 100.00%
Long-term Debt | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 128 | $ 147

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