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Mortgage Servicing Assets (Tables)
 9 Months Ended
Sep. 30, 2025
Servicing Asset [Abstract]  
Schedule of Changes in Carrying Amount of Mortgage Servicing Assets
Changes in the carrying amount of commercial mortgage servicing assets are summarized as follows:
 Three months ended September 30,Nine months ended September 30,
Dollars in millions2025202420252024
Balance at beginning of period$587 $612 $609 $638 
Servicing retained from loan sales23 17 55 44 
Purchases2 7 10 17 
Amortization(32)(30)(94)(93)
Balance at end of period$580 $606 $580 $606 
Fair value at end of period$759 $816 $759 $816 
Changes in the carrying amount of residential mortgage servicing assets are summarized as follows:
Three months ended September 30,Nine months ended September 30,
Dollars in millions2025202420252024
Balance at beginning of period$112 $109 $111 $108 
Servicing retained from loan sales4 4 11 9 
Amortization(3)(3)(9)(8)
Temporary (impairments) recoveries(1)(2)(1)(1)
Balance at end of period$112 $108 $112 $108 
Fair value at end of period$136 $129 $136 $129 
Schedule of Range and Weighted-Average of Significant Unobservable Inputs The range and weighted average of the significant unobservable inputs used to determine the fair value of our commercial mortgage servicing assets at September 30, 2025, and September 30, 2024, along with the valuation techniques, are shown in the following table: 
September 30, 2025September 30, 2024
Valuation Technique
Significant
Unobservable Input
Range
Weighted Average		RangeWeighted Average
Discounted cash flowExpected defaults1.00 %2.00 %1.01 %1.00 %2.00 %1.01 %
Residual cash flows discount rate7.02 %10.75 %10.47 %7.17 %10.72 %10.38 %
Escrow earn rate4.23 %4.37 %4.36 %4.51 %4.56 %4.51 %
Loan assumption rate— %2.49 %2.00 %— %2.36 %1.99 %
The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at September 30, 2025, and September 30, 2024, along with the valuation techniques, are shown in the following table:
September 30, 2025September 30, 2024
Valuation Technique
Significant
Unobservable Input
RangeWeighted AverageRangeWeighted Average
Discounted cash flowPrepayment speed6.33 %32.33 %8.45 %7.08 %53.34 %8.33 %
Discount rate6.50 %8.75 %6.61 %6.50 %8.75 %6.60 %
Servicing cost$70.00 $4,332 $76.08 $70.00 $3,582 $75.25