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Customer Financing (Scheduled Receipts On Customer Financing) (Details) - Customer Financing [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Principal payments on notes receivable [Abstract]  
2018 $ 149
2019 167
2020 132
2021 175
2022 37
Beyond 2022 17
Sales-type/finance lease payments receivable [Abstract]  
2018 236
2019 223
2020 185
2021 120
2022 107
Beyond 2022 288
Operating lease equipment payments receivable [Abstract]  
2018 417
2019 86
2020 69
2021 53
2022 40
Beyond 2022 $ 62