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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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