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Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Distributions from equity investments | $ 50 | $ 111 | $ 56
Distributions from equity investments, return of capital | $ 16 | 6 | 14
Electric Utilities and Infrastructure | DATC |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 50.00% |  |
Electric Utilities and Infrastructure | Pioneer |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 50.00% |  |
Gas Utilities and Infrastructure | Sabal Trail |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 7.50% |  |
Gas Utilities and Infrastructure | SustainRNG |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 29.68% |  |
Gas Utilities and Infrastructure | Sustain T&W |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 70.00% |  |
Gas Utilities and Infrastructure | Sustain Liberty |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 70.00% |  |
Other | NMC |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 17.50% |  |
Board representation and voting rights, ownership interest (as a percent) | 25.00% |  |
Piedmont |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Distributions from equity investments | $ 9 | $ 31 | 8
Distributions from equity investments, return of capital | $ 1 |  | $ 2
Piedmont | Gas Utilities and Infrastructure | Cardinal |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 21.49% |  |
Piedmont | Gas Utilities and Infrastructure | Pine Needle |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 45.00% |  |
Piedmont | Gas Utilities and Infrastructure | Hardy Storage |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Ownership interest (as a percent) | 50.00% |  |

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