Consolidated Statements of Changes in Common Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	AOCI	Noncontrolling Interest
Beginning balance at Dec. 31, 2022	$ 4,666	$ 4,088	$ 418	$ (2)	$ 162
Beginning balance (in shares) at Dec. 31, 2022		40
Total comprehensive income available to common shareholder	97		92		5
Dividend to parent	(50)		(50)
Ending balance at Mar. 31, 2023	4,713	$ 4,088	460	(2)	167
Ending balance (in shares) at Mar. 31, 2023		40
Beginning balance at Dec. 31, 2023	4,862	$ 4,088	592	(1)	183
Beginning balance (in shares) at Dec. 31, 2023		40
Total comprehensive income available to common shareholder	80		74		6
Dividend to parent	(62)		(62)
Ending balance at Mar. 31, 2024	$ 4,880	$ 4,088	$ 604	$ (1)	$ 189
Ending balance (in shares) at Mar. 31, 2024		40