Regulatory Matters (Other Regulatory Matters Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 28, 2021
Public Utilities, General Disclosures [Line Items]
Equity in losses of unconsolidated affiliates	$ (113)	$ (62)	$ 2,005
Other current liabilities	2,167	2,423
Asset retirement obligations	$ 773	$ 647
Atlantic Coast Pipeline (ACP)
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage	47.00%
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP)
Public Utilities, General Disclosures [Line Items]
Equity in losses of unconsolidated affiliates			$ 2,100
Other current liabilities	$ 59
Other liabilities, noncurrent	47
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) | Current Liabilities
Public Utilities, General Disclosures [Line Items]
Guarantor obligations settled				$ 855
Asset retirement obligations	$ 106