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Customer Financing (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Customer Financing [Line Items]          
Financing Receivable, Individually Evaluated for Impairment $ 401   $ 401   $ 409
Impaired Financing Receivable, Recorded Investment 388   388   398
Operative lease incentive         250
Asset Impairment Charges     106 $ 63  
Sales-Type and Direct Financing Leases, Lease Income 15   47    
Operating Lease, Lease Income 34   105    
Operating Lease, Variable Lease Income 6   14    
Sales-type, Direct Financing Leases, Residual Value of Leased Asset $ 403   $ 403   $ 425
B Credit Rating [Member]          
Customer Financing [Line Items]          
Percentage of Credit Default Rates Applied to Customers 22.10%   22.10%    
BB Credit Rating [Member]          
Customer Financing [Line Items]          
Percentage of Credit Default Rates Applied to Customers 5.80%   5.80%    
BBB Credit Rating [Member]          
Customer Financing [Line Items]          
Percentage of Credit Default Rates Applied to Customers 0.60%   0.60%    
Lease Incentive Receivable [Member]          
Customer Financing [Line Items]          
Asset Impairment Charges   $ 250