CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2020		1,000,000
Beginning balance at Dec. 31, 2020	$ 6,769	$ 0	$ 4,585	$ 2,206	$ (22)
Increase (Decrease) in Stockholders' Equity
Net income	128			128
Other comprehensive income	1				1
Dividends declared on common stock	(108)			(108)
Contribution of capital by parent	400		400
Balance (in shares) at Mar. 31, 2021		1,000,000
Ending balance at Mar. 31, 2021	$ 7,190	$ 0	4,985	2,226	(21)
Balance (in shares) at Dec. 31, 2021	1,000,000	1,000,000
Beginning balance at Dec. 31, 2021	$ 7,573	$ 0	5,202	2,391	(20)
Increase (Decrease) in Stockholders' Equity
Net income	127			127
Other comprehensive income	0
Dividends declared on common stock	$ (167)			(167)
Balance (in shares) at Mar. 31, 2022	1,000,000	1,000,000
Ending balance at Mar. 31, 2022	$ 7,533	$ 0	$ 5,202	$ 2,351	$ (20)