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	555
Total other comprehensive income	1				1
Dividends declared to parent	(388)			(388)
Contribution of capital by parent	387		387
Balance (in shares) at Sep. 30, 2022		100
Ending Balance at Sep. 30, 2022	8,999	$ 0	6,813	2,207	(21)
Balance (in shares) at Jun. 30, 2022		100
Beginning Balance at Jun. 30, 2022	8,688	$ 0	6,623	2,087	(22)
Increase (Decrease) in Stockholder's Equity
Net income	247			247
Total other comprehensive income	1				1
Dividends declared to parent	(127)			(127)
Contribution of capital by parent	190		190
Balance (in shares) at Sep. 30, 2022		100
Ending Balance at Sep. 30, 2022	$ 8,999	$ 0	6,813	2,207	(21)
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	536
Total other comprehensive income	1				1
Dividends declared to parent	(533)			(533)
Contribution of capital by parent	$ 119		119
Balance (in shares) at Sep. 30, 2023	100	100
Ending Balance at Sep. 30, 2023	$ 9,353	$ 0	7,111	2,263	(21)
Balance (in shares) at Jun. 30, 2023		100
Beginning Balance at Jun. 30, 2023	9,260	$ 0	7,086	2,195	(21)
Increase (Decrease) in Stockholder's Equity
Net income	229			229
Total other comprehensive income	0
Dividends declared to parent	(161)			(161)
Contribution of capital by parent	$ 25		25
Balance (in shares) at Sep. 30, 2023	100	100
Ending Balance at Sep. 30, 2023	$ 9,353	$ 0	$ 7,111	$ 2,263	$ (21)