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Debt Securities (Schedule Of Contractual Maturities Of Investment Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Available-for-sale securities, due within one year, amortized cost $ 344  
Available-for-sale securities, after one year through five years, amortized cost 2,755  
Available-for-sale securities, after five years through ten years, amortized cost 1,763  
Available-for-sale securities, after ten years, amortized cost 6,472  
Available-for-sale securities, amortized cost 11,334 $ 8,858
Available-for-sale securities, due within one year, fair value 344  
Available-for-sale securities, after one year through five years, fair value 2,744  
Available-for-sale securities, after five years through ten years, fair value 1,736  
Available-for-sale securities, after ten years, fair value 6,189  
Debt Securities, Available-for-sale 11,013 8,275
Held-to-maturity securities, due within one year, amortized cost 0  
Held-to-maturity securities, after one year through five years, amortized cost 0  
Held-to-maturity securities, after five years through ten years, amortized cost 0  
Held-to-maturity securities, after ten years, amortized cost 18  
Investment securities held to maturity 18 2
Held-to-maturity securities, due within one year, fair value 0  
Held-to-maturity securities, after one year through five years, fair value 0  
Held-to-maturity securities, after five years through ten years, fair value 0  
Held-to-maturity securities, after ten years, fair value 18  
Held-to-maturity securities, fair value $ 18 $ 3