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Investment Securities - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
AFS transferred to HTM $ 697,000,000 $ 749,000,000    
Percentage of investment portfolio considered investment grade 99.00%      
Allowance for credit losses on HTM investment securities $ 0 0 $ 2,000,000 $ 2,000,000
Allowance for credit losses on available-for-sale securities 2,000,000 2,000,000    
Provision 0      
Charge-offs 0      
Marketable securities, unrealized gain (loss) $ (6,960,000,000)      
Number of securities in loss position | security 2,061      
Asset pledged as collateral        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Debt securities $ 80,700,000,000 $ 70,520,000,000