CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2021		1,000,000
Beginning balance at Dec. 31, 2021	$ 7,573	$ 0	$ 5,202	$ 2,391	$ (20)
Increase (Decrease) in Stockholders' Equity
Net income	514			514
Other comprehensive income	0
Dividends declared on common stock	(463)			(463)
Contribution of capital by parent	11		11
Balance (in shares) at Sep. 30, 2022		1,000,000
Ending balance at Sep. 30, 2022	7,635	$ 0	5,213	2,442	(20)
Balance (in shares) at Jun. 30, 2022		1,000,000
Beginning balance at Jun. 30, 2022	7,548	$ 0	5,213	2,355	(20)
Increase (Decrease) in Stockholders' Equity
Net income	269			269
Other comprehensive income	0
Dividends declared on common stock	(182)			(182)
Balance (in shares) at Sep. 30, 2022		1,000,000
Ending balance at Sep. 30, 2022	$ 7,635	$ 0	5,213	2,442	(20)
Balance (in shares) at Dec. 31, 2022	1,000,000	1,000,000
Beginning balance at Dec. 31, 2022	$ 7,836	$ 0	5,374	2,480	(18)
Increase (Decrease) in Stockholders' Equity
Net income	526			526
Other comprehensive income	4				4
Dividends declared on common stock	(425)			(425)
Contribution of capital by parent	$ 211		211
Balance (in shares) at Sep. 30, 2023	1,000,000	1,000,000
Ending balance at Sep. 30, 2023	$ 8,152	$ 0	5,585	2,581	(14)
Balance (in shares) at Jun. 30, 2023		1,000,000
Beginning balance at Jun. 30, 2023	8,072	$ 0	5,585	2,502	(15)
Increase (Decrease) in Stockholders' Equity
Net income	260			260
Other comprehensive income	1				1
Dividends declared on common stock	$ (181)			(181)
Balance (in shares) at Sep. 30, 2023	1,000,000	1,000,000
Ending balance at Sep. 30, 2023	$ 8,152	$ 0	$ 5,585	$ 2,581	$ (14)