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Loans - First and Second Liens within Outstanding Residential Mortgage Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 61,452	$ 51,867	$ 49,600
Consumer Loans [Member] \| Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	17,473	16,676
Consumer Loans [Member] \| Residential Mortgage [Member] \| First lien of Closed end [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	15,086	14,113
Consumer Loans [Member] \| Residential Mortgage [Member] \| Second lien of Closed end [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	197	237
Consumer Loans [Member] \| Residential Mortgage [Member] \| Revolving Second lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 2,190	$ 2,326

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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