Derivatives - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash	$ 489	$ 380
Total trading revenues	97	157	$ 360
Hedged amount of foreign currency denominated loans	17	9
Derivative liabilities	675	929
Derivative asset	576	458
Derivative Instruments With Adjustable Collateral Posting Thresholds | Additional Derivative Agreements
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds	12	5
Net fair value of derivative liabilities with adjustable posting thresholds	188	268
Collateral received	95	106
Securities posted collateral	83	61
Derivative Instruments With Accelerated Termination Provisions | Additional Derivative Agreements
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds	12	378
Net fair value of derivative liabilities with adjustable posting thresholds	188	268
Collateral received	95	479
Securities posted collateral	83	61
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount	351	242
Derivative liability, notional amount	874	742
Embedded Derivative Financial Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities	0	0
Derivative asset	0	0
Visa Class B Shares
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities related to sale	23	27
Derivative valuation adjustment	15	22
Counterparties
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash receivables	406	159
Collateral cash	$ 33	$ 42