Commitments, Contingencies, Guarantees, and Others - Unfunded Lending Commitments: Contractual Amount and Carrying Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Unfunded lending commitments, contractual amount	$ 432,887	$ 409,314
Off-balance sheet lending commitment, carrying value	157	204
Credit Card:
Loss Contingencies [Line Items]
Unused commitments to extend credit, contractual amount	384,993	359,507
Other excluding credit card
Loss Contingencies [Line Items]
Unused commitments to extend credit, contractual amount	46,408	48,405
Off-balance sheet lending commitment, carrying value	134	176
Advised line of credit	4,500	4,400
Letter of credit
Loss Contingencies [Line Items]
Standby letters of credit and commercial letters of credit, contractual amount	1,486	1,402
Off-balance sheet lending commitment, carrying value	$ 23	$ 28