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Customer Financing Customer Financing (Scheduled Receipts of Customer Financing) (Details) - USD ($)
$ in Millions
Mar. 31, 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 $ 203  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Two 159  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Three 115  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four 106  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Five 110  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, after Rolling Year Five 167  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received 860  
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount (189)  
Sales-type and Direct Financing Leases, Residual Value of Leased Asset 425  
Investment in sales-type/finance leases 1,096 $ 1,125
Lessor, Operating Lease, Payments, Rolling Maturity [Abstract]    
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months 130  
Lessor, Operating Lease, Payments to be Received, Rolling Year Two 106  
Lessor, Operating Lease, Payments to be Received, Rolling Year Three 91  
Lessor, Operating Lease, Payments to be Received, Rolling Year Four 74  
Lessor, Operating Lease, Payments to be Received, Rolling Year Five 55  
Lessor, Operating Lease, Payments to be Received, after Rolling Year Five 77  
Lessor, Operating Lease, Payments to be Received $ 533