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Regulatory Matters (Other Regulatory Matters Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 28, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Equity in losses of unconsolidated affiliates |  | $ (28) | $ 2,005 | $ (162) |
Other current liabilities |  | 2,471 | 2,936 |  |
Asset retirement obligations |  | $ 647 | $ 718 |  |
Atlantic Coast Pipeline (ACP) |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Joint owner ownership percentage |  | 47.00% |  |  |
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Equity in losses of unconsolidated affiliates | $ 2,100 |  |  |  |
Other current liabilities |  | $ 47 |  |  |
Other liabilities, noncurrent |  | 53 |  |  |
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) | Current Liabilities |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Guarantor obligations settled |  |  |  |  | $ 855
Asset retirement obligations |  | $ 100 |  |  |

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