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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value option elected aggregate carrying amount, asset $ 54 $ 98
Residential Consumer Loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value option elected aggregate carrying amount, asset 6,160 12,740
Total Residential Investor Loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value option elected aggregate carrying amount, asset $ 410 $ 848