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Investments (Investments Under Equity Method of Accounting) (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Mar. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Sale of Stock, Percentage of Ownership after Transaction | 5.00% |  |
Align RNG, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Unfunded Commitments | $ 8 |  |
Wrangler Retail Gas Holdings LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage ownership in total units | 15.00% |  | 15.00%
Atlantic Coast Pipeline | Other Current Liabilities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Liability associated with its investment | $ 113 | $ 114 |

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