CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2020		100
Beginning balance at Dec. 31, 2020	$ 3,298	$ 0	$ 2,790	$ 509	$ (1)
Increase (Decrease) in Stockholders' Equity
Net income	260			260
Dividends declared to parent	(253)			(253)
Contributions of capital by parent	301		301
Ending balance (in shares) at Sep. 30, 2021		100
Ending balance at Sep. 30, 2021	3,606	$ 0	3,091	516	(1)
Beginning balance (in shares) at Jun. 30, 2021		100
Beginning balance at Jun. 30, 2021	3,597	$ 0	3,094	504	(1)
Increase (Decrease) in Stockholders' Equity
Net income	134			134
Dividends declared to parent	(122)			(122)
Contributions of capital by parent	(3)		(3)
Ending balance (in shares) at Sep. 30, 2021		100
Ending balance at Sep. 30, 2021	$ 3,606	$ 0	3,091	516	(1)
Beginning balance (in shares) at Dec. 31, 2021	100	100
Beginning balance at Dec. 31, 2021	$ 3,603	$ 0	3,091	513	(1)
Increase (Decrease) in Stockholders' Equity
Net income	283			283
Dividends declared to parent	(261)			(261)
Contributions of capital by parent	$ 210		210
Ending balance (in shares) at Sep. 30, 2022	100	100
Ending balance at Sep. 30, 2022	$ 3,835	$ 0	3,301	535	(1)
Beginning balance (in shares) at Jun. 30, 2022		100
Beginning balance at Jun. 30, 2022	3,847	$ 0	3,301	547	(1)
Increase (Decrease) in Stockholders' Equity
Net income	138			138
Dividends declared to parent	$ (150)			(150)
Ending balance (in shares) at Sep. 30, 2022	100	100
Ending balance at Sep. 30, 2022	$ 3,835	$ 0	$ 3,301	$ 535	$ (1)