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Investment Securities - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
security
Jun. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
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 $ 1,000,000   $ 1,000,000   $ 1,000,000 $ 1,000,000    
Provision 0   0          
Allowance for credit losses on available-for-sale securities 0 $ 0 0 $ 0   0 $ 2,000,000 $ 2,000,000
Charge-offs 0   0          
Charge-offs 0 $ 0   $ 0        
Unrealized loss     $ 6,600,000,000          
Number of securities in loss position | security     1,776          
Asset pledged as collateral                
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]                
Debt securities $ 85,830,000,000   $ 85,830,000,000     $ 71,300,000,000