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, 2020		1,000,000
Beginning balance at Dec. 31, 2020	$ 6,769	$ 0	$ 4,585	$ 2,206	$ (22)
Increase (Decrease) in Stockholders' Equity
Net income	241			241
Other comprehensive income	1				1
Dividends declared on common stock	(216)			(216)
Contribution of capital by parent	600		600
Balance (in shares) at Jun. 30, 2021		1,000,000
Ending balance at Jun. 30, 2021	7,395	$ 0	5,185	2,231	(21)
Balance (in shares) at Mar. 31, 2021		1,000,000
Beginning balance at Mar. 31, 2021	7,190	$ 0	4,985	2,226	(21)
Increase (Decrease) in Stockholders' Equity
Net income	112			112
Other comprehensive income	0
Dividends declared on common stock	(107)			(107)
Contribution of capital by parent	200		200
Balance (in shares) at Jun. 30, 2021		1,000,000
Ending balance at Jun. 30, 2021	$ 7,395	$ 0	5,185	2,231	(21)
Balance (in shares) at Dec. 31, 2021	1,000,000	1,000,000
Beginning balance at Dec. 31, 2021	$ 7,573	$ 0	5,202	2,391	(20)
Increase (Decrease) in Stockholders' Equity
Net income	245			245
Other comprehensive income	0
Dividends declared on common stock	(281)			(281)
Contribution of capital by parent	$ 11		11
Balance (in shares) at Jun. 30, 2022	1,000,000	1,000,000
Ending balance at Jun. 30, 2022	$ 7,548	$ 0	5,213	2,355	(20)
Balance (in shares) at Mar. 31, 2022		1,000,000
Beginning balance at Mar. 31, 2022	7,533	$ 0	5,202	2,351	(20)
Increase (Decrease) in Stockholders' Equity
Net income	118			118
Other comprehensive income	0
Dividends declared on common stock	(114)			(114)
Contribution of capital by parent	$ 11		11
Balance (in shares) at Jun. 30, 2022	1,000,000	1,000,000
Ending balance at Jun. 30, 2022	$ 7,548	$ 0	$ 5,213	$ 2,355	$ (20)