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, 2023	$ 4,862	$ 4,088	$ 592	$ (1)	$ 183
Beginning balance (in shares) at Dec. 31, 2023		40
Total comprehensive income available to common shareholder	143		131		12
Dividend to parent	(125)		(125)
Ending balance at Jun. 30, 2024	4,880	$ 4,088	598	(1)	195
Ending balance (in shares) at Jun. 30, 2024		40
Beginning balance at Mar. 31, 2024	4,880	$ 4,088	604	(1)	189
Beginning balance (in shares) at Mar. 31, 2024		40
Total comprehensive income available to common shareholder	63		57		6
Dividend to parent	(63)		(63)
Ending balance at Jun. 30, 2024	4,880	$ 4,088	598	(1)	195
Ending balance (in shares) at Jun. 30, 2024		40
Beginning balance at Dec. 31, 2024	4,982	$ 4,088	689	(1)	206
Beginning balance (in shares) at Dec. 31, 2024		40
Total comprehensive income available to common shareholder	257		243		14
Dividend to parent	(40)		(40)
Capital contribution from parent	250	$ 250
Ending balance at Jun. 30, 2025	5,449	$ 4,338	892	(1)	220
Ending balance (in shares) at Jun. 30, 2025		40
Beginning balance at Mar. 31, 2025	5,382	$ 4,338	831	(1)	214
Beginning balance (in shares) at Mar. 31, 2025		40
Total comprehensive income available to common shareholder	107		101		6
Dividend to parent	(40)		(40)
Ending balance at Jun. 30, 2025	$ 5,449	$ 4,338	$ 892	$ (1)	$ 220
Ending balance (in shares) at Jun. 30, 2025		40