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Investment Securities - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Percentage of investment portfolio considered investment grade 99.00% 99.00%  
Allowance for credit losses on HTM investment securities $ 0 $ 0 $ 0
Allowance for credit losses on available-for-sale securities 2,000,000 2,000,000 2,000,000
AFS securities writeoff 0    
Marketable securities, unrealized gain (loss)   $ (5,350,000,000)  
Number of securities in loss position | security   2,050  
Agency MBS transferred to HTM 64,261,000,000 $ 64,261,000,000 42,430,000,000
Available-for-sale securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Provision 0    
Held-to-maturity securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
AFS transferred to HTM 21,230,000,000    
Net unrealized loss, AFS to HTM transfer 1,290,000,000    
Asset pledged as collateral      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Debt securities $ 74,570,000,000 $ 74,570,000,000 $ 80,810,000,000