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Leases (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Components of the net investment in sales-type and direct financing leases
Aggregate future minimum lease payments to be received	$ 10,882	$ 10,437
Unguaranteed residual values accruing to the lessor's benefit	1,079	1,191
Unearned income	(1,332)	(1,402)
Initial direct costs	181	189
Total net investment in sales-type and direct financing leases (a)	$ 10,810	$ 10,415

The lessor's asset under sales type and direct financing leases. The net investment in direct financing and sales-type leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) estimated executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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