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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]            
Payments allocated to future purchase activity $ 0          
Allowance for credit loss $ 2,075,000,000 $ 2,078,000,000 $ 2,106,000,000 $ 2,098,000,000 $ 2,172,000,000 $ 2,241,000,000
Portfolio reserve rates 11.23%     11.89%    
Other Loans            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit loss $ 45,000,000   $ 26,000,000