Revenue from Contracts with Customers - EGTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Total operating revenue	$ 25,920	$ 25,602	$ 26,337
EGTS
Revenue from External Customer [Line Items]
Customer revenue	993	1,020	979
Other revenue	4	4	(6)
Total operating revenue	997	1,024	973
Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	937	954	900
Nonregulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	56	66	79
Gas transportation | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	650	656	644
Gas storage | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	279	274	248
Wholesale | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	7	22	8
Other | Regulated assets
Revenue from External Customer [Line Items]
Customer revenue	126	136	105
Other | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	$ 1	$ 2	$ 0