Asset Retirement Obligations - EGTS - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 1,340	$ 1,341
Additions	32	15
Retirements	(122)	(144)
Accretion	47	47
Ending Balance	1,328	1,340
Total ARO liability	1,328	1,340
EGTS
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	55	71
Additions	4	0
Retirements	(12)	(17)
Accretion	1	1
Ending Balance	48	55
Current liabilities	25	33
Other long-term liabilities	23	22
Total ARO liability	$ 48	$ 55