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Derivatives - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount $ 12,129,000,000 $ 13,706,000,000  
Derivative, Collateral, Right to Reclaim Cash 0 1,000,000  
Pledged collateral, securities 90,000,000 78,000,000  
Cash collateral held 24,000,000 16,000,000  
Securities collateral held or repledged 1,000,000 1,000,000  
Collateral Securities Repledged, Delivered, or Used 0 0  
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged 0 0  
Over the Counter [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Pledged collateral, securities 83,000,000 88,000,000  
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 35,000,000    
Not Designated as Hedging Instrument      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount 9,503,000,000 $ 11,396,000,000  
Interest rate swaps | Not Designated as Hedging Instrument      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Notional Amount $ 7,600,000,000