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Variable Interest Entities - Schedule of Options to Repurchase Delinquent Loans (Details) - Nonconsolidated entities - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Variable Interest Entity [Line Items]    
Loans repurchased or option to repurchase $ 704 $ 856
Real estate owned/ foreclosed 2 2
Residential mortgage loans    
Variable Interest Entity [Line Items]    
Real estate owned/ foreclosed $ 8 $ 9