Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets, Gross [Abstract]
Adjustments to securities and hedging transactions	$ 1,080	$ 1,066
Tax credit carryforwards	679	506
Adjustments to loan value	420	569
State and local taxes	301	305
Fixed assets	257	165
Other	454	426
Gross deferred tax assets	3,191	3,037
Valuation allowance	(138)	(176)
Deferred tax assets, net of valuation allowance	3,053	2,861
Deferred tax liabilities
Lease transactions	653	1,117
Deferred acquisition costs	380	387
Long-term debt	62	64
Other	52	57
Gross deferred tax liabilities	1,147	1,625
Net deferred tax assets	1,906	1,236
Deferred tax asset	882	808
Net deferred tax assets	1,916	1,247
Net deferred tax liabilities	$ 10	$ 10