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Non-Derivative Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets, carrying amount |  | $ 91,803 | $ 111,059 | $ 99,348
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Income (Loss) from Equity Method Investments |  |
NEER [Member] | Mountain Valley Pipeline [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets, carrying amount |  | $ 1,900 |  |
Fair value of long-lived assets |  | 400 |  |
Impairment of long-lived assets | $ 800 | 1,500 |  |
Impairment of long-lived assets, after tax | 600 | $ 1,200 |  |
Equity method investment write-off, carrying amount | 600 |  |  |
Equity method investment, liability | $ 200 |  |  |

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