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	660			660
Total other comprehensive income	2				2
Common dividends declared to parent	(466)			(466)
Contribution of capital by parent	656		656
Balance (in shares) at Dec. 31, 2021		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	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)
Increase (Decrease) in Stockholder's Equity
Net income	695			695
Total other comprehensive income	2				2
Common dividends declared to parent	(605)			(605)
Contribution of capital by parent	$ 420		420
Balance (in shares) at Dec. 31, 2023	100	100
Ending Balance at Dec. 31, 2023	$ 9,742	$ 0	$ 7,412	$ 2,350	$ (20)