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Regulatory Matters (Other Regulatory Matters Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 28, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |
Equity in losses of unconsolidated affiliates | $ (113) | $ (62) | $ 2,005 |
Other current liabilities | 2,167 | 2,423 |  |
Asset retirement obligations | $ 773 | $ 647 |  |
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 | $ 59 |  |  |
Other liabilities, noncurrent | 47 |  |  |
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) | Current Liabilities |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Guarantor obligations settled |  |  |  | $ 855
Asset retirement obligations | $ 106 |  |  |

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