Derivatives - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash payables	$ 224,000,000		$ 224,000,000		$ 184,000,000
Total trading revenues	34,000,000	$ 85,000,000	133,000,000	$ 291,000,000
Hedged amount of foreign currency denominated loans	11,000,000		11,000,000		7,000,000
Derivative assets	311,000,000		311,000,000		323,000,000
Derivative liability	1,027,000,000		1,027,000,000		103,000,000
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	5,000,000		5,000,000		67,000,000
Net fair value of derivative liabilities with adjustable posting thresholds	290,000,000		290,000,000		26,000,000
Collateral received	110,000,000		110,000,000		205,000,000
Securities posted collateral	61,000,000		61,000,000		14,000,000
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	194,000,000		194,000,000		74,000,000
Net fair value of derivative liabilities with adjustable posting thresholds	290,000,000		290,000,000		30,000,000
Collateral received	302,000,000		302,000,000		213,000,000
Securities posted collateral	61,000,000		61,000,000		18,000,000
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount	217,000,000		217,000,000		257,000,000
Derivative liability, notional amount	738,000,000		738,000,000		500,000,000
Embedded Derivative Financial Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets	0		0		0
Derivative liability	0		0		0
Visa Class B Shares
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities related to sale	20,000,000		20,000,000		23,000,000
Derivative valuation adjustment	12,000,000		12,000,000		19,000,000
Counterparties
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash receivables	220,000,000		220,000,000		181,000,000
Collateral cash payables	$ 39,000,000		$ 39,000,000		$ 102,000,000