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, 2021		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
Dividends declared to parent	(261)			(261)
Contribution of capital by parent	197		197
Balance (in shares) at Jun. 30, 2022		100
Ending Balance at Jun. 30, 2022	8,688	$ 0	6,623	2,087	(22)
Balance (in shares) at Mar. 31, 2022		100
Beginning Balance at Mar. 31, 2022	8,571	$ 0	6,506	2,087	(22)
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
Ending Balance at Jun. 30, 2022	$ 8,688	$ 0	6,623	2,087	(22)
Balance (in shares) at Dec. 31, 2022	100	100
Beginning Balance at Dec. 31, 2022	$ 9,230	$ 0	6,992	2,260	(22)
Increase (Decrease) in Stockholder's Equity
Net income	307
Total other comprehensive income	1				1
Dividends declared to parent	(372)			(372)
Contribution of capital by parent	$ 94		94
Balance (in shares) at Jun. 30, 2023	100	100
Ending Balance at Jun. 30, 2023	$ 9,260	$ 0	7,086	2,195	(21)
Balance (in shares) at Mar. 31, 2023		100
Beginning Balance at Mar. 31, 2023	9,327	$ 0	7,057	2,291	(21)
Increase (Decrease) in Stockholder's Equity
Net income	93			93
Total other comprehensive income	0
Dividends declared to parent	(189)			(189)
Contribution of capital by parent	$ 29		29
Balance (in shares) at Jun. 30, 2023	100	100
Ending Balance at Jun. 30, 2023	$ 9,260	$ 0	$ 7,086	$ 2,195	$ (21)