Losses and Gains on Impairments, Divestitures and Other Write-downs _GW (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Goodwill [Line Items]
Impairment of goodwill		$ 1,600
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
Goodwill [Line Items]
Estimated weighted average cost of capital	9.25%
Natural Gas Pipelines Non-regulated
Goodwill [Line Items]
Impairment of goodwill		$ 1,000
Natural Gas Pipelines Non-regulated | Valuation, Market Approach
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 Non-regulated | Valuation Technique, Discounted Cash Flow
Goodwill [Line Items]
Period Used For Projection		6 years 6 months
Estimated weighted average cost of capital		8.00%
Natural Gas Pipelines Non-regulated | Weighted Market Approach and Income Approach [Member]
Goodwill [Line Items]
Enterprise Value to EBITDA Multiple Valuation		11
Natural Gas Pipelines Non-regulated | Valuation, Income Approach
Goodwill [Line Items]
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach	0.75
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
Goodwill [Line Items]
Impairment of goodwill		$ 0
Products Pipelines | Maximum
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	10.00%