Derivatives - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash	$ 440	$ 489
Total trading revenues	154	97	$ 157
Hedged amount of foreign currency denominated loans	16	17
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	5	12
Net fair value of derivative liabilities with adjustable posting thresholds	187	188
Collateral received	82	95
Securities posted collateral	96	83
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	6	12
Net fair value of derivative liabilities with adjustable posting thresholds	187	188
Collateral received	82	95
Securities posted collateral	96	83
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount	268	351
Derivative liability, notional amount	916	874
Visa Class B Shares
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities related to sale	15	23
Derivative valuation adjustment	15	15
Counterparties
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash receivables	541	406
Collateral cash	$ 25	$ 33