v3.26.3
DEPOSITS AND OTHER CUSTOMER ACCOUNTS - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Demand deposit overdrafts that have been reclassified as loan balances $ 292 $ 395
CD in denominations greater than $250,000 7,200 6,400
FHLB Advances | SBNA    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Letters of credit $ 714 $ 100