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, 2021	$ 4,525	$ 4,016	$ 335	$ (1)	$ 175
Beginning balance (in shares) at Dec. 31, 2021		40
Total comprehensive income available to common shareholder	107		103		4
Dividend to parent	(110)		(100)		(10)
Ending balance at Mar. 31, 2022	4,522	$ 4,016	338	(1)	169
Ending balance (in shares) at Mar. 31, 2022		40
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