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Securities - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]    
Debt securities, available-for-sale and held-to-maturity, allowance for credit loss $ 1 $ 1
Agency residential mortgage-backed securities (“RMBS”)    
Schedule of Held-to-Maturity Securities [Line Items]    
AOCI, transfers from AFS to HTM Securities, gross unrealized losses, amortized cost 755  
Available-for-sale securities transferred to held-to-maturity $ 759