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Mortgage Servicing Assets (Tables)
 6 Months Ended
Jun. 30, 2024
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 June 30,Six months ended June 30,
Dollars in millions2024202320242023
Balance at beginning of period$631 $634 $638 $653 
Servicing retained from loan sales9 17 27 26 
Purchases4 6 10 10 
Amortization(32)(30)(63)(62)
Temporary (impairments) recoveries— — — — 
Balance at end of period$612 $627 $612 $627 
Fair value at end of period$866 $893 $866 $893 
Changes in the carrying amount of residential mortgage servicing assets are summarized as follows:
Three months ended June 30,Six months ended June 30,
Dollars in millions2024202320242023
Balance at beginning of period$108 $105 $108 $106 
Servicing retained from loan sales3 3 5 4 
Purchases— — — — 
Amortization(3)(2)(5)(4)
Temporary (impairments) recoveries(a)
1 — 1 — 
Balance at end of period$109 $106 $109 $106 
Fair value at end of period$133 $130 $133 $130 
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 June 30, 2024, and June 30, 2023, along with the valuation techniques, are shown in the following table: 
June 30, 2024June 30, 2023
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 rate7.37 %10.64 %10.25 %7.41 %10.56 %10.16 %
Escrow earn rate5.16 %5.26 %5.17 %5.09 %5.23 %5.11 %
Loan assumption rate— %2.19 %1.98 %— %2.16 %1.97 %
The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at June 30, 2024, and June 30, 2023, along with the valuation techniques, are shown in the following table:
June 30, 2024June 30, 2023
Valuation Technique
Significant
Unobservable Input
RangeWeighted AverageRangeWeighted Average
Discounted cash flowPrepayment speed6.59 %47.09 %7.66 %6.14 %40.07 %7.32 %
Discount rate6.50 %8.75 %6.60 %7.35 %8.35 %7.39 %
Servicing cost$70.00 $3,582 $74.59 $62.00 $8,075 $67.7