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, 2020	$ 4,484	$ 4,017	$ 277	$ (2)	$ 192
Beginning balance (in shares) at Dec. 31, 2020		40
Total comprehensive income (loss) available(attributable) to common shareholder	55		51		4
Dividend to parent	(75)		(75)
Ending balance at Mar. 31, 2021	4,464	$ 4,017	253	(2)	196
Ending balance (in shares) at Mar. 31, 2021		40
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 (loss) available(attributable) 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