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Derivatives - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 11,425,000,000   $ 11,425,000,000   $ 12,129,000,000
Derivative, Collateral, Right to Reclaim Cash 2,000,000   2,000,000   0
Pledged collateral, securities 54,000,000   54,000,000   90,000,000
Cash collateral held 12,000,000   12,000,000   24,000,000
Securities Received as Collateral 3,000,000   3,000,000   1,000,000
Collateral Securities Repledged, Delivered, or Used 0   0   0
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged 0   0   0
Over the Counter [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Pledged collateral, securities 119,000,000   119,000,000   83,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 0 $ 0 0 $ 0  
AOCI Attributable to Parent [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     31,000,000    
Not Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 8,759,000,000   8,759,000,000   9,503,000,000
Not Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 7,200,000,000   $ 7,200,000,000   $ 7,600,000,000