Variable Interest Entities and Securitization Activities - Fair Value of Transfers of Assets with Continuing Involvement (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity
Derivative assets	$ 38,154	$ 37,850
Derivative liabilities	34,568	44,938
SPE
Variable Interest Entity
Retained interests	618	732
Interests purchased in the secondary market	264	356
Derivative assets	891	400
Derivative liabilities	284	436
SPE | Investment grade
Variable Interest Entity
Retained interests	538	663
Interests purchased in the secondary market	169	212
SPE | Non-investment grade
Variable Interest Entity
Retained interests	80	69
Interests purchased in the secondary market	95	144
SPE | Level 2
Variable Interest Entity
Retained interests	576	669
Interests purchased in the secondary market	238	258
Derivative assets	891	388
Derivative liabilities	194	435
SPE | Level 2 | Investment grade
Variable Interest Entity
Retained interests	536	663
Interests purchased in the secondary market	168	196
SPE | Level 2 | Non-investment grade
Variable Interest Entity
Retained interests	40	6
Interests purchased in the secondary market	70	62
SPE | Level 3
Variable Interest Entity
Retained interests	42	63
Interests purchased in the secondary market	26	98
Derivative assets	0	12
Derivative liabilities	90	1
SPE | Level 3 | Investment grade
Variable Interest Entity
Retained interests	2	0
Interests purchased in the secondary market	1	16
SPE | Level 3 | Non-investment grade
Variable Interest Entity
Retained interests	40	63
Interests purchased in the secondary market	$ 25	$ 82