Consolidated Statements of Changes in Equity (Unaudited) - EGTS - USD ($) $ in Millions	Total	EGTS	Common Stock EGTS	Additional Paid-in Capital EGTS	Retained Earnings EGTS	Accumulated Other Comprehensive Loss, Net EGTS
Balance (shares) at Dec. 31, 2021			60,101,000,000
Balance at Dec. 31, 2021		$ 2,540	$ 609	$ 1,241	$ 721	$ (31)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,926	207			207
Other comprehensive income		1				1
Dividends declared		(189)			(189)
Contributions		24		24
Balance (shares) at Sep. 30, 2022			60,101,000,000
Balance at Sep. 30, 2022		2,583	$ 609	1,265	739	(30)
Balance (shares) at Jun. 30, 2022			60,101,000,000
Balance at Jun. 30, 2022		2,583	$ 609	1,254	750	(30)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ (842)	81			81
Other comprehensive income		0
Dividends declared		(92)			(92)
Contributions		11		11
Balance (shares) at Sep. 30, 2022			60,101,000,000
Balance at Sep. 30, 2022		$ 2,583	$ 609	1,265	739	(30)
Balance (shares) at Dec. 31, 2022	76,000,000	60,101	60,101,000,000
Balance at Dec. 31, 2022	$ 46,832	$ 2,600	$ 609	1,275	746	(30)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 2,558	171			171
Other comprehensive income		1				1
Dividends declared		(154)			(154)
Contributions		$ 25		25
Balance (shares) at Sep. 30, 2023	76,000,000	60,101	60,101,000,000
Balance at Sep. 30, 2023	$ 48,643	$ 2,643	$ 609	1,300	763	(29)
Balance (shares) at Jun. 30, 2023			60,101,000,000
Balance at Jun. 30, 2023		2,623	$ 609	1,300	743	(29)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 494	44			44
Other comprehensive income		0
Dividends declared		$ (24)			(24)
Balance (shares) at Sep. 30, 2023	76,000,000	60,101	60,101,000,000
Balance at Sep. 30, 2023	$ 48,643	$ 2,643	$ 609	$ 1,300	$ 763	$ (29)