Derivatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash payables	$ 662		$ 662		$ 380
Total trading revenues	19	$ 34	68	$ 133
Hedged amount of foreign currency denominated loans	16		16		9
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds	6		6		5
Net fair value of derivative liabilities with adjustable posting thresholds	310		310		268
Collateral received	86		86		106
Securities posted collateral	138		138		61
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions
Derivative Instruments, Gain (Loss) [Line Items]
Net fair value of derivative assets with adjustable posting thresholds	624		624		378
Net fair value of derivative liabilities with adjustable posting thresholds	310		310		268
Collateral received	709		709		479
Securities posted collateral	138		138		61
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount	353		353		242
Derivative liability, notional amount	896		896		742
Visa Class B Shares
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities related to sale	26		26		27
Derivative valuation adjustment			15		22
Counterparties
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash receivables	629		629		159
Collateral cash payables	$ 27		$ 27		$ 42