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	516
Total other comprehensive income	1				1
Dividends declared to parent	(362)			(362)
Contribution of capital by parent	563		563
Balance (in shares) at Sep. 30, 2021		100
Ending Balance at Sep. 30, 2021	8,310	$ 0	6,333	2,000	(23)
Balance (in shares) at Jun. 30, 2021		100
Beginning Balance at Jun. 30, 2021	8,099	$ 0	6,210	1,912	(23)
Increase (Decrease) in Stockholder's Equity
Net income	215			215
Total other comprehensive income	0
Dividends declared to parent	(127)			(127)
Contribution of capital by parent	123		123
Balance (in shares) at Sep. 30, 2021		100
Ending Balance at Sep. 30, 2021	$ 8,310	$ 0	6,333	2,000	(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	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	100
Ending Balance at Sep. 30, 2022	$ 8,999	$ 0	6,813	2,207	(21)
Beginning Balance at Jun. 30, 2022	8,688		6,623	2,087
Increase (Decrease) in Stockholder's Equity
Net income	247			247
Total other comprehensive income	1
Dividends declared to parent	(127)			(127)
Contribution of capital by parent	$ 190		190
Balance (in shares) at Sep. 30, 2022	100	100
Ending Balance at Sep. 30, 2022	$ 8,999	$ 0	$ 6,813	$ 2,207	$ (21)