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Impairments Goodwill Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | $ 21,451 |  | $ 21,451 |
Goodwill impairment loss |  |  |  | (1,600) |
Goodwill, Balance | $ 19,851 |  |  | 19,851 |
Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | 14,249 |  | 14,249 |
Goodwill impairment loss |  |  |  | 0 |
Goodwill, Balance | 14,249 |  |  | 14,249 |
Natural Gas Pipelines Non-Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | 3,343 |  | 3,343 |
Goodwill impairment loss | (1,000) |  |  | (1,000) |
Goodwill, Balance | 2,343 |  |  | 2,343 |
CO2 |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | 1,528 |  | 1,528 |
Goodwill impairment loss |  | (600) |  | (600) |
Goodwill, Balance | $ 928 |  |  | $ 928 |
CO2 | Maximum |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 10.00% |  |  | 10.00% |
Products Pipelines Terminals |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | 151 |  | $ 151 |
Goodwill impairment loss |  |  |  | 0 |
Goodwill, Balance | $ 151 |  |  | 151 |
Terminals |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | 802 |  | 802 |
Goodwill impairment loss |  |  |  | 0 |
Goodwill, Balance | $ 802 |  |  | $ 802 |
Terminals | Maximum |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 10.00% |  |  | 10.00% |
Products Pipelines |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill, Balance |  | $ 1,378 |  | $ 1,378 |
Goodwill impairment loss |  |  |  | 0 |
Goodwill, Balance | $ 1,378 |  |  | $ 1,378 |
Products Pipelines | Maximum |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 10.00% |  |  | 10.00% |
CO2 |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Goodwill impairment loss | $ 0 |  | $ 0 | $ (600) | $ 0
Valuation Technique, Discounted Cash Flow | Natural Gas Pipelines Non-Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Number of Years of Projection to Determine Fair Value |  |  |  | 6 years 6 months |
Estimated Weighted Average Cost Of Capital | 8.00% |  |  | 8.00% |
Valuation Technique, Discounted Cash Flow | CO2 |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Estimated Weighted Average Cost Of Capital |  | 9.25% |  |  |
Valuation Technique, Discounted Cash Flow | Oil and Gas Properties | CO2 |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Estimated Weighted Average Cost Of Capital |  | 10.50% |  |  |
Valuation, Market Approach | Natural Gas Pipelines Non-Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach | 0.25 |  |  | 0.25 |
Enterprise Value to EBITDA Multiple Valuation | 10 |  |  | 10 |
Valuation, Income Approach | Natural Gas Pipelines Non-Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach | 0.75 |  |  | 0.75 |
Weighted Market Approach and Income Approach | Natural Gas Pipelines Non-Regulated |  |  |  |  |
Impairment of Goodwill, Long-lived assets and equity investments [Line Items] |  |  |  |  |
Enterprise Value to EBITDA Multiple Valuation | 11 |  |  | 11 |

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