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Debt Securities (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
security
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]            
Debt Securities Transferred from Available for Sale to Held to Maturity, Amortized Cost $ 2,000 $ 1,000   $ 2,000    
Debt securities available for sale $ 26,333     $ 26,333   $ 26,224
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 1,531     1,531   1,722
Debt Securities, Available-for-Sale, Realized Loss     $ 50 $ 27    
Debt Securities, Available-for-sale, Realized Gain $ 1       $ 100  
Unrealized gains (losses) on securities available for sale:            
Debt Securities, Available-for-sale [Line Items]            
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringBeforeTax 74 $ 153   227    
Securities gains, net [Member]            
Debt Securities, Available-for-sale [Line Items]            
Gross Realized Gain (Loss), net       (26)    
Asset Pledged as Collateral            
Debt Securities, Available-for-sale [Line Items]            
Debt securities available for sale $ 22,000     $ 22,000   $ 20,900