Revenue from Contracts with Customers - EGTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Total operating revenue	$ 26,337	$ 25,150	$ 20,952
EGTS
Revenue from External Customer [Line Items]
Customer revenue	979	892	915
Other revenue	(6)	(1)	1
Total operating revenue	973	891	916
Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	900	819	815
Nonregulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	79	73	100
Gas transportation | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	644	574	583
Gas storage | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	248	188	191
Wholesale | Regulated assets | EGTS
Revenue from External Customer [Line Items]
Customer revenue	$ 8	$ 57	$ 41