Income Taxes - Tax Rate Reconciliation-Prior Years (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income/(Loss) before income taxes	$ 1,134	$ 1,448	$ (213)
Tax at federal statutory tax rate	238	304	(45)
State taxes	46	92	(22)
Foreign rate differential		1	(10)
Changes in state valuation allowances		(110)	42
Nondeductible loss on Convertible Senior Notes repurchases		56	0
Permanent differences		23	31
Stock compensation		(19)	0
Recognition of uncertain tax benefits		1	12
Deferred impact of state tax rate changes		(24)	3
Effect of changes in tax laws or rates enacted in the current period		0	(17)
Return to provision adjustments		(1)	(5)
Income tax expense/(benefit)	$ 270	$ 323	$ (11)
Effective income tax rate (as a percent)	23.80%	22.30%	5.20%