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	126			126
Dividends declared to parent	(131)			(131)
Contributions of capital by parent	304		304
Ending balance (in shares) at Jun. 30, 2021		100
Ending balance at Jun. 30, 2021	3,597	$ 0	3,094	504	(1)
Beginning balance (in shares) at Mar. 31, 2021		100
Beginning balance at Mar. 31, 2021	3,608	$ 0	3,094	515	(1)
Increase (Decrease) in Stockholders' Equity
Net income	68			68
Dividends declared to parent	(79)			(79)
Ending balance (in shares) at Jun. 30, 2021		100
Ending balance at Jun. 30, 2021	$ 3,597	$ 0	3,094	504	(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	145			145
Dividends declared to parent	(111)			(111)
Contributions of capital by parent	$ 210		210
Ending balance (in shares) at Jun. 30, 2022	100	100
Ending balance at Jun. 30, 2022	$ 3,847	$ 0	3,301	547	(1)
Beginning balance (in shares) at Mar. 31, 2022		100
Beginning balance at Mar. 31, 2022	3,610	$ 0	3,099	512	(1)
Increase (Decrease) in Stockholders' Equity
Net income	93			93
Dividends declared to parent	(58)			(58)
Contributions of capital by parent	$ 202		202
Ending balance (in shares) at Jun. 30, 2022	100	100
Ending balance at Jun. 30, 2022	$ 3,847	$ 0	$ 3,301	$ 547	$ (1)