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SECURITIES - Schedule of Securities Pledged as Collateral (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Securities pledged (carrying value), to secure public deposits, trust deposits and for other purposes as required by law	$ 3,640	$ 3,874
Securities pledged (carrying value), as collateral for short-term borrowings	$ 246	$ 279
Securities pledged as a percent of total securities	61.10%	63.00%

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- Definition

Percentage as of the balance sheet date of securities that had been pledged for various purposes.

+ References

No definition available.

+ Details

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- Definition

The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged to secure public deposits, trust deposits and for other purposes as required by law.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5086-111524

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