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Long-Term Incentive Compensation Plans:Stock-Based Compensation (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2020 stock_awards shares | Dec. 31, 2019 stock_awards | Dec. 31, 2018 stock_awards
Compensation Related Costs [Abstract] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 3.7 |  |
Number of types of stock-based awards granted (in types) | stock_awards | 2 | 2 | 2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2.5 |  |

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- Definition The number of types of stock-based awards granted during the period. + References No definition available. + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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