v3.26.1
Fair Value Measurement - Schedule of Differences Between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding - Fair Value Option (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance $ 207 $ 236
Fair Value 208 241
Fair Value Over / (Under) UPB 1 5
Non-accrual loans:    
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance 5 6
Fair Value 5 7
Fair Value Over / (Under) UPB 0 1
Accrual loans:    
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance 202 230
Fair Value 203 234
Fair Value Over / (Under) UPB 1 4
Loans held for sale:    
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance 207 236
Fair Value 208 241
Fair Value Over / (Under) UPB 1 5
Loans held for sale: | Non-accrual loans:    
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance 5 6
Fair Value 5 7
Fair Value Over / (Under) UPB 0 1
Loans held for sale: | Accrual loans:    
Fair Value, Option, Quantitative Disclosures    
Unpaid Principal Balance 202 230
Fair Value 203 234
Fair Value Over / (Under) UPB $ 1 $ 4