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Finance Assets, net (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance assets, net $ 899,000,000 $ 1,028,000,000    
Investments in finance leases 922,000,000 1,060,000,000    
Allowance for credit losses 23,000,000 32,000,000 $ 42,000,000 $ 42,000,000
Third-party nonrecourse debt 600,000,000 800,000,000    
Leases with contingent rentals 0 0    
Decrease to estimated residual values 8,000,000 28,000,000 65,000,000  
Decrease to allowance $ 9,000,000 10,000,000 0  
Aircraft [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases, percentage 40.00%      
Electric Power [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases, percentage 27.00%      
Railcar [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases, percentage 13.00%      
Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases, percentage 10.00%      
Manufacturing [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases, percentage 10.00%      
Decrease in Unguaranteed Residual Value Resulting in Reduction to Net Revenues [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reduction in net revenues $ 5,000,000 18,000,000 $ 41,000,000  
Finance Leases Financing Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases 922,000,000 1,060,000,000    
Outside of U.S. [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investments in finance leases $ 0 $ 0