Commitments, Contingencies, Guarantees, and Others - Unfunded Lending Commitments: Contractual Amount and Carrying Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Unfunded lending commitments, contractual amount	$ 425,004	$ 409,314
Off-balance sheet lending commitment, carrying value	165	204
Credit Card
Loss Contingencies [Line Items]
Unused commitments to extend credit, contractual amount	377,423	359,507
Other excluding credit card
Loss Contingencies [Line Items]
Unused commitments to extend credit, contractual amount	46,147	48,405
Off-balance sheet lending commitment, carrying value	141	176
Advised line of credit	4,000	4,400
Letter of credit
Loss Contingencies [Line Items]
Standby letters of credit and commercial letters of credit, contractual amount	1,434	1,402
Off-balance sheet lending commitment, carrying value	$ 24	$ 28