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Investment Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]                
Proceeds from sales of available-for-sale securities $ 6,930,000,000   $ 8,405,000,000 $ 4,567,000,000        
Pre-tax loss $ 80,000,000   $ 80,000,000          
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 $ 1,000,000 $ 1,000,000 $ 0 $ 0
Provision 0 1,000,000 0 1,000,000        
Allowance for credit losses on available-for-sale securities 0 0 0 0   0 $ 0 $ 2,000,000
Charge-offs 0 0 0 0        
Charge-offs 0 $ 0   $ 0        
Unrealized loss     $ 4,770,000,000          
Number of securities in loss position | security     1,478          
Asset pledged as collateral                
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]                
Debt securities $ 85,970,000,000   $ 85,970,000,000     $ 71,300,000,000