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) Income, 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 (loss)	$ (129)	55			55
Other comprehensive income (loss)		1				1
Balance (shares) at Mar. 31, 2022			60,101,000,000
Balance at Mar. 31, 2022		$ 2,596	$ 609	1,241	776	(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 (loss)	$ 989	68			68
Other comprehensive income (loss)		1				1
Dividends declared		(9)			(9)
Contributions		$ 7		7
Balance (shares) at Mar. 31, 2023	76,000,000	60,101	60,101,000,000
Balance at Mar. 31, 2023	$ 47,853	$ 2,667	$ 609	$ 1,282	$ 805	$ (29)