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Customer Financing (Scheduled Receipts On Customer Financing) (Details) (Customer Financing [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Customer Financing [Member]
 
Principal payments on notes receivable [Abstract]  
2013 $ 194
2014 101
2015 57
2016 41
2017 42
Beyond 2017 157
Sales-type/finance lease payments receivable [Abstract]  
2013 290
2014 231
2015 230
2016 226
2017 207
Beyond 2017 803
Operating lease equipment payments receivable [Abstract]  
2013 474
2014 172
2015 162
2016 97
2017 55
Beyond 2017 $ 104