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Investments (Investments Under Equity Method of Accounting) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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	$ 59
Wrangler Retail Gas Holdings LLC
Schedule of Equity Method Investments [Line Items]
Percentage ownership in total units	15.00%
Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Liability associated with its investment	$ 113	$ 1,100
Cove Point
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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