Mortgage Servicing Assets (Tables)

6 Months Ended

Jun. 30, 2023

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 millions	2023		2022		2023		2022
Balance at beginning of period	$	634	$	644	$	653	$	634
Servicing retained from loan sales	17		22		26		52
Purchases	6		12		10		23
Amortization	(30)		(31)		(62)		(62)
Temporary (impairments) recoveries	—		—		—		—
Balance at end of period	$	627	$	647	$	627	$	647
Fair value at end of period	$	893	$	938	$	893	$	938

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 millions	2023		2022		2023		2022
Balance at beginning of period	$	105	$	101	$	106	$	93
Servicing retained from loan sales	3		6		4		17
Purchases	—		—		—		—
Amortization	(2)		(3)		(4)		(7)
Temporary (impairments) recoveries	—		—		—		1
Balance at end of period	$	106	$	104	$	106	$	104
Fair value at end of period	$	130	$	125	$	130	$	125

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, 2023, and June 30, 2022, along with the valuation techniques, are shown in the following table:


Dollars in millions		June 30, 2023						June 30, 2022
Valuation Technique	Significant Unobservable Input	Range				Weighted Average		Range				Weighted Average

Discounted cash flow	Expected defaults	1.00	%	2.00	%	1.01	%	1.00	%	2.00	%	1.11	%
	Residual cash flows discount rate	7.41	%	10.56	%	10.16	%	8.25	%	10.18	%	9.42	%
	Escrow earn rate	5.09	%	5.23	%	5.11	%	3.34	%	3.79	%	3.61	%

	Loan assumption rate	—	%	2.16	%	1.97	%	—	%	1.57	%	1.24	%

The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at June 30, 2023, and June 30, 2022, along with the valuation techniques, are shown in the following table:


		June 30, 2023									June 30, 2022
Valuation Technique	Significant Unobservable Input	Range						Weighted Average			Range						Weighted Average

Discounted cash flow	Prepayment speed	6.14		%	40.07		%	7.32		%	6.99		%	43.84		%	7.96		%
	Discount rate	7.35		%	8.35		%	7.39		%	7.50		%	8.56		%	7.53		%
	Servicing cost	$	62.00		$	8,075		$	67.70		$	62.00		$	8,075		$	66.75