Capitalized servicing assets (Tables)

12 Months Ended

Dec. 31, 2023

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)	2023			2022			2021			2023			2022			2021
Beginning balance	$	194		$	241		$	231		$	126		$	133		$	134
Originations		13			7			66			27			24			33
Purchases		350			—			—			—			—			—
Acquired in business combination		—			12			—			—			—			—
Amortization		(101	)		(66	)		(56	)		(30	)		(31	)		(34	)
		456			194			241			123			126			133
Valuation allowance		—			—			(24	)		—			—			—
Ending balance, net	$	456		$	194		$	217		$	123		$	126		$	133

	Residential Mortgage Loans				Commercial Mortgage Loans
(Dollars in millions)	2023		2022		2023		2022
Balances at period end
Loans serviced for others	$	40,021	$	22,365	$	24,157	$	22,166
Loans sub-serviced for others		115,321		96,027		3,873		3,841
Total loans serviced for others	$	155,342	$	118,392	$	28,030	$	26,007

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 speeds		6.93	%
Impact on fair value of 10% adverse change	$	(16	)
Impact on fair value of 20% adverse change		(31	)
Weighted-average OAS		7.90	%
Impact on fair value of 10% adverse change	$	(18	)
Impact on fair value of 20% adverse change		(35	)
Weighted-average discount rate					14.43	%
Impact on fair value of 10% adverse change				$	(6	)
Impact on fair value of 20% adverse change					(12	)