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Loans and Loans Held for Sale - Composition of Net Investment in Direct Financing Leases (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Loans [Line Items]    
Direct financing lease receivables $ 3,429 $ 4,143
Unearned income (260) (368)
Unguaranteed residual value 261 308
Deferred fees and costs 25 31
Net investment in direct financing leases $ 3,455 $ 4,114