Leasing Activities (Narrative) (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Leasing Activities [Abstract]
Lease investments	$ 1.4	$ 1.3

- Definition

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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