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Customer Financing Customer Financing (Scheduled Receipts of Customer Financing) (Details) - USD ($)
$ in Millions
Sep. 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 $ 179  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Two 134  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Three 97  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four 109  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Five 121  
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, after Rolling Year Five 140  
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received 780  
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount (167)  
Sales-type, Direct Financing Leases, Residual Value of Leased Asset 403 $ 425
Investment in sales-type/finance leases 1,016 $ 1,125
Lessor, Operating Lease, Payments, Rolling Maturity [Abstract]    
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months 118  
Lessor, Operating Lease, Payments to be Received, Rolling Year Two 93  
Lessor, Operating Lease, Payments to be Received, Rolling Year Three 83  
Lessor, Operating Lease, Payments to be Received, Rolling Year Four 61  
Lessor, Operating Lease, Payments to be Received, Rolling Year Five 46  
Lessor, Operating Lease, Payments to be Received, after Rolling Year Five 57  
Lessor, Operating Lease, Payments to be Received $ 458