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Regulatory Matters (Other Regulatory Matters Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Public Utilities, General Disclosures [Line Items] |  |  |
Equity in losses of unconsolidated affiliates | $ 2,005 | $ (162) | $ (83)
Income tax expense (benefit) from continuing operations | (236) | 519 | $ 448
Other | 2,936 | 2,367 |
Asset retirement obligations | $ 718 | $ 881 |
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 |  |
Income tax expense (benefit) from continuing operations | 393 |  |
Restructuring and related cost, expected cost | 20 |  |
Other | 928 |  |
Other liabilities, noncurrent | 8 |  |
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) | Current Liabilities |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Face value of guarantees | 860 |  |
Asset retirement obligations | $ 76 |  |

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