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Commitments and Contingent Liabilities Contingent Debt (Details) - Indirect Guarantee of Indebtedness [Member] $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 714 | $ 1,070
Number of equity investees subject to contingent obligation | 4 | 3
Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Percentage of Debt Guaranteed | 50.00% |
Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Percentage of Debt Guaranteed | 100.00% |
Revolving Credit Facility [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | $ 50 |
Revolving Credit Facility [Member] | Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 27 |
Senior Notes [Member] | Cortez Pipeline Company |  |
Guarantor Obligations [Line Items] |  |
Senior Notes | 100 |
Notes Payable to Banks [Member] | Cortez Expansion Capital Corp [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 120 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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