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Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss)    
Cost $ 10,139 $ 10,825
SG&A expense 4,691 5,445
Other (income) and expense (73) 413
Interest expense 210 165
Cost of services    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity 10 19
Cost of sales    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity 18 (17)
Cost of financing    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity (18) 4
SG&A expense    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity 141 (33)
Other (income) and expense    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity (69) 49
Interest expense    
Derivative Instruments, Gain (Loss)    
Gains/(losses) of total hedge activity (20) 4
Services    
Derivative Instruments, Gain (Loss)    
Cost 8,359 8,835
Sales    
Derivative Instruments, Gain (Loss)    
Cost 1,516 1,722
Financing    
Derivative Instruments, Gain (Loss)    
Cost $ 264 $ 269