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Organization and Basis of Presentation (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Noncontrolling Interest [Line Items] |  |  |  |  |
Incurred costs | $ 1,450,000,000 | $ 1,484,000,000 | $ 4,142,000,000 | $ 4,337,000,000 |
Current Liabilities: Other | 2,829,000,000 |  | 2,829,000,000 |  | $ 2,367,000,000
ACP |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Current Liabilities: Other | 935,000,000 |  | 935,000,000 |  | 0
Piedmont Natural Gas |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Incurred costs | 75,000,000 | $ 78,000,000 | 234,000,000 | $ 241,000,000 |
Current Liabilities: Other | 59,000,000 |  | 59,000,000 |  | 67,000,000
Piedmont Natural Gas | Other |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Prepaid assets | 23,000,000 |  | 23,000,000 |  | $ 3,000,000
Incremental COVID-19 costs |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Incurred costs | 39,000,000 |  | 91,000,000 |  |
Deferred costs | 56,000,000 |  | 56,000,000 |  |
Waived late payment fees | $ 29,000,000 |  | $ 54,000,000 |  |

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