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, 2019		100
Beginning Balance at Dec. 31, 2019	$ 6,996	$ 0	$ 4,940	$ 2,083	$ (27)
Increase (Decrease) in Stockholder's Equity
Net income	588			588
Total other comprehensive income (loss)	3				3
Common dividends declared to parent	(824)			(824)
Contribution of capital by parent	830		830
Adoption of ASC Topic 326	1			1
Balance (in shares) at Dec. 31, 2020		100
Ending Balance at Dec. 31, 2020	7,592	$ 0	5,770	1,846	(24)
Increase (Decrease) in Stockholder's Equity
Net income	660			660
Total other comprehensive income (loss)	2				2
Common dividends declared to parent	(466)			(466)
Contribution of capital by parent	$ 656		656
Balance (in shares) at Dec. 31, 2021	100	100
Ending Balance at Dec. 31, 2021	$ 8,444	$ 0	6,426	2,040	(22)
Increase (Decrease) in Stockholder's Equity
Net income	727			727
Total other comprehensive income (loss)	0
Common dividends declared to parent	(507)			(507)
Contribution of capital by parent	$ 566		566
Balance (in shares) at Dec. 31, 2022	100	100
Ending Balance at Dec. 31, 2022	$ 9,230	$ 0	$ 6,992	$ 2,260	$ (22)