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Leases (Tables)
12 Months Ended
Dec. 31, 2011
Leases [Abstract]  
Components of the net investment in sales-type and direct financing leases
                 
(Dollars in Millions)   2011     2010  

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  

 

(a) The accumulated allowance for uncollectible minimum lease payments was $91 million and $118 million at December 31, 2011 and 2010, respectively.
Minimum future lease payments to be received from sales-type and direct financing leases
         
(Dollars in Millions)       

2012

  $ 2,586  

2013

    2,581  

2014

    3,751  

2015

    1,288  

2016

    378  

Thereafter

    298