Derivatives - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 11,224,000,000	$ 12,129,000,000
Derivative, Collateral, Right to Reclaim Cash	2,000,000	0
Pledged collateral, securities	48,000,000	90,000,000
Cash collateral held	7,000,000	24,000,000
Securities collateral held or repledged	5,000,000	1,000,000
Collateral Securities Repledged, Delivered, or Used	0	0
Over the Counter [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Pledged collateral, securities	82,000,000	62,000,000
Collateral Pledged
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Collateral, Right to Reclaim Cash	12,000,000	21,000,000
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net reclassifications from AOCI to earnings resulting from the discontinuance of cash-flow hedges due to forecasted transactions that were no longer probable of occurring	0	0	$ 0
Accumulated Other Comprehensive Income (Loss), net of tax
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months	25,000,000
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	8,447,000,000	9,503,000,000
Interest rate swaps | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 7,200,000,000	$ 7,600,000,000