Note Borrowings (Additional Information) (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Disclosure [Line Items]
Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds	$ 4,100	$ 3,900
Federal Home Loan Bank Advances And Letters Of Credit Amount Used	929	762
Pledged Financial Instruments Not Separately Reported Loans For Letter Of Credit Facilities	225
Federal Reserve Bank Advances
Debt Disclosure [Line Items]
Line Of Credit Facility Current Borrowing Capacity	$ 1,300	$ 1,300

Debt Disclosure [Line Items]

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- Definition

Amount of advances and letters of credit obtained from the Federal Home Loan Bank (FHLB).

+ References

No definition available.

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- Definition

The carrying amount as of the date of the latest financial statement presented of loans which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

No definition available.

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- Definition

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22 (b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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