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Customer Financing Customer Financing (Scheduled Receipts of Customer Financing) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Sales-type and Direct Financing Leases, Lease Receivable, Rolling Maturity [Abstract]    
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Rolling Twelve Months $ 186  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Two 141  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Three 92  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four 107  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Five 116  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, after Rolling Year Five 143  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received 785  
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount (172)  
Sales-type and Direct Financing Leases, Residual Value of Leased Asset 425  
Investment in sales-type/finance leases 1,038 $ 1,125
Lessor, Operating Lease, Payments, Rolling Maturity [Abstract]    
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months 123  
Lessor, Operating Lease, Payments to be Received, Rolling Year Two 99  
Lessor, Operating Lease, Payments to be Received, Rolling Year Three 87  
Lessor, Operating Lease, Payments to be Received, Rolling Year Four 67  
Lessor, Operating Lease, Payments to be Received, Rolling Year Five 51  
Lessor, Operating Lease, Payments to be Received, after Rolling Year Five 67  
Lessor, Operating Lease, Payments to be Received $ 494