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Capitalized servicing assets (Tables)
 12 Months Ended
Dec. 31, 2024
Transfers and Servicing [Abstract]  
Servicing Asset at Amortized Cost
Changes in capitalized servicing assets were as follows:
Year Ended December 31,
Residential Mortgage Loans
Commercial Mortgage Loans
(Dollars in millions)202420232022202420232022
Beginning balance$456 $194 $241 $123 $126 $133 
Originations20 13 7 34 27 24 
Purchases— 350 — — — — 
Acquired in business combination— — 12 — — — 
Amortization(108)(101)(66)(31)(30)(31)
368 456 194 126 123 126 
Valuation allowance— — — — — — 
Ending balance, net$368 $456 $194 $126 $123 $126 
Residential Mortgage LoansCommercial Mortgage Loans
(Dollars in millions)2024202320242023
Balances at period end
Loans serviced for others$38,105 $40,021 $27,474 $24,157 
Loans sub-serviced for others111,544 115,321 4,063 3,873 
Total loans serviced for others$149,649 $155,342 $31,537 $28,030 
Economic Assumptions Used to Determine Fair Value of Capitalized Servicing Rights and Sensitivity of Value to Changes in Assumptions
(Dollars in millions)
Residential
Commercial
Weighted-average prepayment speeds6.44 %
Impact on fair value of 10% adverse change$(14)
Impact on fair value of 20% adverse change(28)
Weighted-average OAS7.58 %
Impact on fair value of 10% adverse change$(17)
Impact on fair value of 20% adverse change(33)
Weighted-average discount rate12.80 %
Impact on fair value of 10% adverse change$(5)
Impact on fair value of 20% adverse change(10)