Variable Interest Entities and Securitization Activities - Fair Value of Transfers of Assets with Continuing Involvement (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Variable Interest Entity
Derivative assets	$ 40,277	$ 36,790
Derivative liabilities	62,183	42,025
SPE
Variable Interest Entity
Retained interests	1,343	1,526
Interests purchased in the secondary market	205	220
Derivative assets	1,656	1,522
Derivative liabilities	881	733
SPE \| Investment grade
Variable Interest Entity
Retained interests	1,183	1,346
Interests purchased in the secondary market	141	176
SPE \| Non-investment grade
Variable Interest Entity
Retained interests	160	180
Interests purchased in the secondary market	64	44
SPE \| Level 2
Variable Interest Entity
Retained interests	1,232	1,468
Interests purchased in the secondary market	178	198
Derivative assets	1,656	1,522
Derivative liabilities	881	733
SPE \| Level 2 \| Investment grade
Variable Interest Entity
Retained interests	1,183	1,346
Interests purchased in the secondary market	141	176
SPE \| Level 2 \| Non-investment grade
Variable Interest Entity
Retained interests	49	122
Interests purchased in the secondary market	37	22
SPE \| Level 3
Variable Interest Entity
Retained interests	111	58
Interests purchased in the secondary market	27	22
Derivative assets	0	0
Derivative liabilities	0	0
SPE \| Level 3 \| Investment grade
Variable Interest Entity
Retained interests	0	0
Interests purchased in the secondary market	0	0
SPE \| Level 3 \| Non-investment grade
Variable Interest Entity
Retained interests	111	58
Interests purchased in the secondary market	$ 27	$ 22