Condensed Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2023	$ 1,983,000,000	$ 0	$ 1,396,000,000	$ 537,000,000	$ 50,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	49,000,000			49,000,000
Other comprehensive income (loss), net of income taxes	3,000,000				3,000,000
Dividends (per share declared and paid)	(48,000,000)			(48,000,000)
Other	2,000,000		3,000,000	(1,000,000)
Ending balance at Mar. 31, 2024	1,989,000,000	0	1,399,000,000	537,000,000	53,000,000
Beginning balance at Dec. 31, 2023	1,983,000,000	0	1,396,000,000	537,000,000	50,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	145,000,000
Other comprehensive income (loss), net of income taxes	1,000,000
Ending balance at Jun. 30, 2024	2,040,000,000	0	1,404,000,000	585,000,000	51,000,000
Beginning balance at Mar. 31, 2024	1,989,000,000	0	1,399,000,000	537,000,000	53,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	97,000,000			97,000,000
Other comprehensive income (loss), net of income taxes	(2,000,000)				(2,000,000)
Dividends (per share declared and paid)	(48,000,000)			(48,000,000)
Other	4,000,000		5,000,000	(1,000,000)
Ending balance at Jun. 30, 2024	2,040,000,000	0	1,404,000,000	585,000,000	51,000,000
Beginning balance at Dec. 31, 2024	2,142,000,000	0	1,413,000,000	694,000,000	35,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,000,000			31,000,000
Other comprehensive income (loss), net of income taxes	(6,000,000)				(6,000,000)
Dividends (per share declared and paid)	(48,000,000)			(48,000,000)
Other	3,000,000		4,000,000	(1,000,000)
Ending balance at Mar. 31, 2025	2,122,000,000	0	1,417,000,000	676,000,000	29,000,000
Beginning balance at Dec. 31, 2024	2,142,000,000	0	1,413,000,000	694,000,000	35,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	105,000,000
Other comprehensive income (loss), net of income taxes	(11,000,000)
Ending balance at Jun. 30, 2025	2,148,000,000	0	1,422,000,000	702,000,000	24,000,000
Beginning balance at Mar. 31, 2025	2,122,000,000	0	1,417,000,000	676,000,000	29,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	73,000,000			73,000,000
Other comprehensive income (loss), net of income taxes	(5,000,000)				(5,000,000)
Dividends (per share declared and paid)	(48,000,000)			(48,000,000)
Other	6,000,000		5,000,000	1,000,000
Ending balance at Jun. 30, 2025	$ 2,148,000,000	$ 0	$ 1,422,000,000	$ 702,000,000	$ 24,000,000