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Finance Assets, net (Schedule of Credit Quality of Investments in Finance Leases) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Gross investments in finance leases $ 1,337 $ 1,656
Finance Leases Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross investments in finance leases 1,337 1,656
Finance Leases Financing Receivable [Member] | Standard and Poors AAA to A minus [Member] | Moodys Aaa to A3 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross investments in finance leases 214 417
Finance Leases Financing Receivable [Member] | Standard and Poors BBB plus to BBB minus [Member] | Moodys Baa1 to Baa3 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross investments in finance leases 722 833
Finance Leases Financing Receivable [Member] | Standard and Poors BB Plus and Lower [Member] | Moodys Ba1 and Lower [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross investments in finance leases $ 401 $ 406