Derivatives - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Collateral cash payables	$ 160,000,000		$ 160,000,000		$ 184,000,000
Total trading revenues	38,000,000	$ 91,000,000	99,000,000	$ 206,000,000
Hedged amount of foreign currency denominated loans	6,000,000		6,000,000		7,000,000
Derivative assets	187,000,000		187,000,000		323,000,000
Derivative liability	578,000,000		578,000,000		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	1,000,000		1,000,000		67,000,000
Net fair value of derivative liabilities with adjustable posting thresholds	192,000,000		192,000,000		26,000,000
Collateral received	142,000,000		142,000,000		205,000,000
Securities posted collateral	44,000,000		44,000,000		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	140,000,000		140,000,000		74,000,000
Net fair value of derivative liabilities with adjustable posting thresholds	192,000,000		192,000,000		30,000,000
Collateral received	284,000,000		284,000,000		213,000,000
Securities posted collateral	44,000,000		44,000,000		18,000,000
Credit Risk Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount	229,000,000		229,000,000		257,000,000
Derivative liability, notional amount	777,000,000		777,000,000		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	28,000,000		28,000,000		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	238,000,000		238,000,000		181,000,000
Collateral cash payables	$ 58,000,000		$ 58,000,000		$ 102,000,000