Servicing Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Unpaid principal balances of loan serviced for others	$ 2,050		$ 1,940
Minimum
Servicing Assets at Fair Value [Line Items]
Fair value of servicing rights, discount rates	8.40%	7.30%
Fair value of servicing rights, prepayment rates	3.90%	1.80%
Maximum
Servicing Assets at Fair Value [Line Items]
Fair value of servicing rights, discount rates	12.60%	12.00%
Fair value of servicing rights, prepayment rates	9.90%	9.60%

Unpaid principal balances of loans serviced for others.

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- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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