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Accounts Receivable and Finance Receivables (Details Textual) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Apr. 02, 2011
Accounts Receivable and Finance Receivables (Textual) [Abstract]      
Unbillable receivables on U.S. Government contracts within accounts receivable $ 197 $ 192  
Recorded investment in accrual status loans that are 90 days past due 0 0  
Contractual delinquency of 60 plus days as percentage of finance receivables held for investment 6.19% 6.70%  
Leveraged leases $ 171   $ 279