CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings
Balance (in shares) at Dec. 31, 2019		933,000
Beginning Balance at Dec. 31, 2019	$ 967	$ 93	$ 537	$ 337
Increase (Decrease) in Stockholder's Equity
Net income	34			34
Common dividends declared to parent	(18)			(18)
Contribution of capital by parent	10		10
Balance (in shares) at Mar. 31, 2020		933,000
Ending Balance at Mar. 31, 2020	$ 993	$ 93	547	353
Balance (in shares) at Dec. 31, 2020	933,000	933,000
Beginning Balance at Dec. 31, 2020	$ 1,068	$ 93	605	370
Increase (Decrease) in Stockholder's Equity
Net income	32			32
Common dividends declared to parent	(20)			(20)
Contribution of capital by parent	$ 30		30
Balance (in shares) at Mar. 31, 2021	933,000	933,000
Ending Balance at Mar. 31, 2021	$ 1,110	$ 93	$ 635	$ 382