Mortgage Servicing Assets (Tables)

6 Months Ended

Jun. 30, 2016

Changes in Carrying Amount of Mortgage Servicing Assets

Changes in the carrying amount of mortgage servicing assets are summarized as follows:


	Three months ended June 30,						Six months ended June 30,
in millions	2016			2015			2016			2015
Balance at beginning of period	$	318		$	324		$	321		$	323
Servicing retained from loan sales		15			18			22			28
Purchases		—			10			12			25
Amortization		(10	)		(23	)		(32	)		(47	)

Balance at end of period	$	323		$	329		$	323		$	329

Fair value at end of period	$	404		$	423		$	404		$	423

Schedule of Range and Weighted-Average of Significant Unobservable Inputs

The range and weighted-average of the significant unobservable inputs used to fair value our mortgage servicing assets at June 30, 2016, December 31, 2015, and June 30, 2015, along with the valuation techniques, are shown in the following table:


June 30, 2016 dollars in millions	Valuation Technique	Significant Unobservable Input	Range (Weighted-Average)
Mortgage servicing assets	Discounted cash flow	Prepayment speed	1.50 - 17.50% (4.20%)
		Expected defaults	1.00 - 3.00% (1.60%)
		Residual cash flows discount rate	7.00 - 15.00% (7.90%)
		Escrow earn rate	0.90 - 3.00% (2.10%)
		Servicing cost	$150 - $2,700 ($1,136)
		Loan assumption rate	0.00 - 3.00% (1.27%)
		Percentage late	0.00 - 2.10% (0.34%)

December 31, 2015 dollars in millions	Valuation Technique	Significant Unobservable Input	Range (Weighted-Average)
Mortgage servicing assets	Discounted cash flow	Prepayment speed	1.90 - 17.20% (4.60%)
		Expected defaults	1.00 - 3.00% (1.70%)
		Residual cash flows discount rate	7.00 - 15.00% (7.80%)
		Escrow earn rate	1.00 - 3.50% (2.30%)
		Servicing cost	$150 - $2,700 ($1,215)
		Loan assumption rate	0.00 - 3.00% (1.34%)
		Percentage late	0.00 - 2.00% (0.33%)

June 30, 2015 dollars in millions	Valuation Technique	Significant Unobservable Input	Range (Weighted-Average)
Mortgage servicing assets	Discounted cash flow	Prepayment speed	1.70 - 14.90% (4.70%)
		Expected defaults	1.00 - 3.00% (1.80%)
		Residual cash flows discount rate	7.00 - 15.00% (7.80%)
		Escrow earn rate	0.70 - 3.30% (2.00%)
		Servicing cost	$150 - $2,750 ($1,088)
		Loan assumption rate	0.20 - 3.00% (1.41%)
		Percentage late	0.00 - 2.00% (0.32%)