CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings
Beginning Balance at Dec. 31, 2018	$ 942	$ 93	$ 510	$ 339
Balance (in shares) at Dec. 31, 2018		933,000
Increase (Decrease) in Stockholder's Equity
Net income	79			79
Dividends, Common Stock, Cash	(81)			(81)
Contribution of capital by parent	27		27
Ending Balance at Dec. 31, 2019	967	$ 93	537	337
Balance (in shares) at Dec. 31, 2019		933,000
Increase (Decrease) in Stockholder's Equity
Net income	107			107
Dividends, Common Stock, Cash	(74)			(74)
Contribution of capital by parent	68		68
Ending Balance at Dec. 31, 2020	$ 1,068	$ 93	605	370
Balance (in shares) at Dec. 31, 2020	933,000	933,000
Increase (Decrease) in Stockholder's Equity
Net income	$ 108			108
Dividends, Common Stock, Cash	(110)			(110)
Contribution of capital by parent	37		37
Ending Balance at Dec. 31, 2021	$ 1,103	$ 93	$ 642	$ 368
Balance (in shares) at Dec. 31, 2021	933,000	933,000