CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	Common stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2020		100
Beginning Balance at Dec. 31, 2020	$ 7,592	$ 0	$ 5,770	$ 1,846	$ (24)
Increase (Decrease) in Stockholder's Equity
Net income	301
Total other comprehensive income	1				1
Dividends declared to parent	(235)			(235)
Contribution of capital by parent	440		440
Balance (in shares) at Jun. 30, 2021		100
Ending Balance at Jun. 30, 2021	8,099	$ 0	6,210	1,912	(23)
Balance (in shares) at Mar. 31, 2021		100
Beginning Balance at Mar. 31, 2021	7,945	$ 0	6,070	1,898	(23)
Increase (Decrease) in Stockholder's Equity
Net income	134			134
Total other comprehensive income	0
Dividends declared to parent	(120)			(120)
Contribution of capital by parent	140		140
Balance (in shares) at Jun. 30, 2021		100
Ending Balance at Jun. 30, 2021	$ 8,099	$ 0	6,210	1,912	(23)
Balance (in shares) at Dec. 31, 2021	100	100
Beginning Balance at Dec. 31, 2021	$ 8,444	$ 0	6,426	2,040	(22)
Increase (Decrease) in Stockholder's Equity
Net income	308
Total other comprehensive income	0				0
Dividends declared to parent	(261)			(261)
Contribution of capital by parent	$ 197		197
Balance (in shares) at Jun. 30, 2022	100	100
Ending Balance at Jun. 30, 2022	$ 8,688	$ 0	6,623	2,087	(22)
Beginning Balance at Mar. 31, 2022	8,571		6,506	2,087
Increase (Decrease) in Stockholder's Equity
Net income	132			132
Total other comprehensive income	0
Dividends declared to parent	(132)			(132)
Contribution of capital by parent	$ 117		117
Balance (in shares) at Jun. 30, 2022	100	100
Ending Balance at Jun. 30, 2022	$ 8,688	$ 0	$ 6,623	$ 2,087	$ (22)