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Summary of Significant Accounting Policies and Other Matters - Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Feb. 28, 2021
Stagecoach Gas Services LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Goodwill, impairment loss | $ 343 |
Stagecoach Gas Services LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Goodwill, impairment loss | 172 |
Equity method investments | 667 | $ 839
Goodwill, impairment loss, after-tax | $ 120 |
Stagecoach Gas Services LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage | 50.00% |

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