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Investment Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
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 1,000,000     1,000,000   2,000,000
Provision for credit losses 0   $ (2,000,000) 10,000,000 $ (26,000,000)  
AFS charge-offs 0          
Marketable securities, unrealized gain (loss)       $ (8,320,000,000)    
Number of securities in loss position | security       2,150    
Available-for-sale securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Provision for credit losses 1,000,000          
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 $ 83,710,000,000     $ 83,710,000,000   $ 80,810,000,000