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Loans - First and Second Liens within Outstanding Residential Mortgage Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 62,932	$ 63,258	$ 53,869
Consumer Loans [Member] \| Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,966	17,695
Consumer Loans [Member] \| Residential Mortgage [Member] \| First lien of Closed end [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	15,730	15,371
Consumer Loans [Member] \| Residential Mortgage [Member] \| Second lien of Closed end [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	175	186
Consumer Loans [Member] \| Residential Mortgage [Member] \| Revolving Second lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,061	$ 2,138

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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