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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Asset Quality - Allowance for Loan and Lease Losses and Corresponding Loan Balances (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans carried at fair value		$ 4
Continuing Operations [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans carried at fair value	$ 3