Related Party Transactions - EGTS - Significant Transactions (Details) - EGTS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Sales of natural gas and transmission and storage services
Related Party Transaction [Line Items]
Related party amounts of transaction	$ 4	$ 26	$ 28
Purchases of natural gas and transmission and storage services
Related Party Transaction [Line Items]
Related party amounts of transaction	0	4	5
Services provided by related parties
Related Party Transaction [Line Items]
Related party amounts of transaction	58	46	26
Services provided to related parties
Related Party Transaction [Line Items]
Related party amounts of transaction	$ 59	$ 62	$ 57