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Non-Derivative Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-lived assets, carrying amount |  |  | $ 125,776.0 | $ 111,059.0 | $ 99,348.0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Income (Loss) from Equity Method Investments |  |  |
Investment in equity method investees |  |  | 6,156.0 | 6,582.0 | $ 6,159.0
Equity Method Investment, Other than Temporary Impairment, After Tax | $ 900.0 |  |  |  |
Equity Method Investment, Other than Temporary Impairment | $ 1,200.0 |  |  |  |
NEER [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Measurement, Trading Price, Per Share | $ 29.70 |  |  |  |
Investment in equity method investees | $ 4,200.0 |  | $ 3,963.0 | $ 4,968.0 |
Equity Method Investments, Fair Value Disclosure | $ 3,000.0 |  |  |  |
NEER [Member] | Mountain Valley Pipeline [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of long-lived assets |  | $ 800.0 |  |  |
Impairment of long-lived assets, after tax |  | 600.0 |  |  |
Equity method investment write-off, carrying amount |  | 600.0 |  |  |
Equity method investment, liability |  | $ 200.0 |  |  |

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