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Variable Interest Entities and Securitization Activities - Transferred Assets with Continuing Involvement (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity
Derivative assets	$ 37,441	$ 38,569
Derivative liabilities	36,460	37,930
SPE
Variable Interest Entity
Interests purchased in the secondary market	407	187
Derivative assets	1,409	1,408
Derivative liabilities	582	400
SPE | Investment grade
Variable Interest Entity
Interests purchased in the secondary market	371	158
SPE | Non-investment grade
Variable Interest Entity
Interests purchased in the secondary market	36	29
SPE | RML
Variable Interest Entity
SPE assets (UPB)	13,509	6,989
Retained interests	636	373
Interests purchased in the secondary market	130	50
Derivative assets	0	0
Derivative liabilities	0	0
SPE | RML | Investment grade
Variable Interest Entity
Retained interests	268	198
Interests purchased in the secondary market	115	45
SPE | RML | Non-investment grade
Variable Interest Entity
Retained interests	368	175
Interests purchased in the secondary market	15	5
SPE | CML
Variable Interest Entity
SPE assets (UPB)	80,099	78,232
Retained interests	1,515	1,466
Interests purchased in the secondary market	123	58
Derivative assets	0	0
Derivative liabilities	0	0
SPE | CML | Investment grade
Variable Interest Entity
Retained interests	457	543
Interests purchased in the secondary market	102	34
SPE | CML | Non-investment grade
Variable Interest Entity
Retained interests	1,058	923
Interests purchased in the secondary market	21	24
SPE | U.S. Agency CMO
Variable Interest Entity
SPE assets (UPB)	14,595	18,174
Retained interests	530	967
Interests purchased in the secondary market	154	79
Derivative assets	0	0
Derivative liabilities	0	0
SPE | U.S. Agency CMO | Investment grade
Variable Interest Entity
Retained interests	530	967
Interests purchased in the secondary market	154	79
SPE | U.S. Agency CMO | Non-investment grade
Variable Interest Entity
Retained interests	0	0
Interests purchased in the secondary market	0	0
SPE | CLN and Other
Variable Interest Entity
SPE assets (UPB)	13,080	12,725
Retained interests	119	71
Interests purchased in the secondary market	0	0
Derivative assets	1,409	1,408
Derivative liabilities	582	400
SPE | CLN and Other | Investment grade
Variable Interest Entity
Retained interests	0	0
Interests purchased in the secondary market	0	0
SPE | CLN and Other | Non-investment grade
Variable Interest Entity
Retained interests	119	71
Interests purchased in the secondary market	$ 0	$ 0

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