Income Taxes - Schedule of Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Tax Disclosure [Abstract]
Tax Jurisdiction of Domicile [Extensible Enumeration]			UNITED STATES
Pre-Tax Net Book Income (“NBI”)	$ 1,868	$ 1,470	$ 3,386	$ 2,900
Amount
Income tax provision at the U.S. federal income tax rate	(392)	(309)	(711)	(609)
Partnership income not subject to federal income tax	386	304	701	600
Texas Margin Tax	(6)	(11)	(23)	(30)
Other	0	0	(1)	(1)
Total provision for income taxes	$ (12)	$ (16)	$ (34)	$ (40)
Percent
Income tax provision at the U.S. federal income tax rate	(21.00%)	(21.00%)	(21.00%)	(21.00%)
Partnership income not subject to federal income tax	20.70%	20.70%	20.70%	20.70%
Texas Margin Tax	(0.30%)	(0.70%)	(0.70%)	(1.00%)
Other	0.00%	0.00%	0.00%	0.00%
Provision for income taxes	(0.60%)	(1.10%)	(1.00%)	(1.40%)
Effective income tax rate	(0.60%)	(1.10%)	(1.00%)	(1.40%)