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Impairments and Losses and Gains on Divestiture Goodwill Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Impairment of goodwill |  |  | $ 1,600
Natural Gas Pipelines - Nonregulated [Member] |  |  |
Goodwill [Line Items] |  |  |
Impairment of goodwill |  | $ 1,000 | $ 1,000
Natural Gas Pipelines - Nonregulated [Member] | Valuation, Market Approach [Member] |  |  |
Goodwill [Line Items] |  |  |
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach |  |  | 0.25
Enterprise Value to EBITDA Multiple Valuation |  |  | 10
Natural Gas Pipelines - Nonregulated [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |
Goodwill [Line Items] |  |  |
Estimated Weighted Average Cost Of Capital |  |  | 8.00%
Period Used For Projection |  |  | 6 years 6 months
Natural Gas Pipelines - Nonregulated [Member] | Weighted Market Approach and Income Approach [Member] |  |  |
Goodwill [Line Items] |  |  |
Enterprise Value to EBITDA Multiple Valuation |  |  | 11
Natural Gas Pipelines - Nonregulated [Member] | Valuation, Income Approach [Member] |  |  |
Goodwill [Line Items] |  |  |
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach |  |  | 0.75
CO2 |  |  |
Goodwill [Line Items] |  |  |
Impairment of goodwill | $ 600 |  | $ 600
CO2 | Maximum |  |  |
Goodwill [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 10.00%
CO2 | Valuation Technique, Discounted Cash Flow [Member] |  |  |
Goodwill [Line Items] |  |  |
Estimated Weighted Average Cost Of Capital | 9.25% |  |
Terminals |  |  |
Goodwill [Line Items] |  |  |
Impairment of goodwill |  |  | $ 0
Terminals | Maximum |  |  |
Goodwill [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 10.00%
Products Pipelines, Pipelines [Member] |  |  |
Goodwill [Line Items] |  |  |
Impairment of goodwill |  |  | $ 0
Products Pipelines, Pipelines [Member] | Maximum |  |  |
Goodwill [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  | 10.00%

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