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Commitments and Contingent Liabilities Contingent Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 1,070 | $ 1,179
Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Equity Method Investment, Ownership Percentage | 52.98% |
Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Percentage of Debt Guaranteed | 100.00% |
Revolving Credit Facility [Member] | Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 50 |
Notes Payable to Banks [Member] | Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 120 |
Partnership Interest [Member] | Revolving Credit Facility [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 50 |
Partnership Interest [Member] | Senior Notes [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 100 |
Debt Securities [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Equity Method Investment, Ownership Percentage | 50.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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