Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Net operating loss carryforward - U.S.	$ 331	$ 2
Net operating loss carryforward - non-U.S.	84	115
Market value difference of loan portfolio	426	322
Accruals	135	186
Tax credits	649	352
Other	210	164
Total deferred tax assets before valuation allowance	1,835	1,141
Less: valuation allowance	(235)	(236)
Total deferred tax assets	1,600	905
Deferred tax liabilities
Depreciable assets	3,637	2,354
Deferred acquisition costs	232	159
Other	153	125
Total deferred tax liabilities	4,022	2,638
Net deferred tax liability	(2,422)	$ (1,733)
State
Deferred tax assets
Net operating loss carryforward - U.S.	331
Foreign Tax Jurisdiction
Deferred tax assets
Net operating loss carryforward - non-U.S.	84
Tax Year 2038 | State
Deferred tax assets
Net operating loss carryforward - U.S.	16
Tax Year 2044
Deferred tax assets
Tax credits	649
Tax Year 2044 | Foreign Tax Jurisdiction
Deferred tax assets
Net operating loss carryforward - non-U.S.	67
Expiring Indefinitely | State
Deferred tax assets
Net operating loss carryforward - U.S.	315
Expiring Indefinitely | Foreign Tax Jurisdiction
Deferred tax assets
Net operating loss carryforward - non-U.S.	$ 17