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Leases - Components of Net Investment in Sales-Type and Direct Financing Leases (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Capital Leased Assets [Line Items]    
Aggregate future minimum lease payments to be received $ 10,738 $ 10,882
Unguaranteed residual values accruing to the lessor's benefit 890 1,079
Unearned income (1,123) (1,332)
Initial direct costs 175 181
Total net investment in sales-type and direct financing leases $ 10,680 $ 10,810