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Summary of Loans Modified in a TDR (Parenthetical) (Detail) (Consolidated Variable Interest Entity, Commercial Portfolio Segment, Commercial Mortgage Loans, Owner Occupied, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Consolidated Variable Interest Entity \| Commercial Portfolio Segment \| Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications
Financing Receivable, Modifications, Number of Contracts	5
Financing Receivable Modifications Post Modification Recorded Investment	$ 29
Allowance for Loan and Lease Losses, Adjustments, Net	7
Allowance for Loan and Lease Losses, Write-offs	$ 2

Reflects the net amount of other additions and reductions in the reserve for credit losses.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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