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Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss)        
Cost $ 9,130 $ 9,692 $ 28,202 $ 29,982
SG&A expense 4,647 5,024 15,849 15,171
Other (income) and expense 253 (31) 614 (850)
Interest expense 323 432 971 990
Cost of services        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity 10 22 18 52
Cost of sales        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity (4) 10 14 40
Cost of financing        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity 3 (11) 9 (47)
SG&A expense        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity 58 20 24 199
Other (income) and expense        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity 101 (561) 92 (358)
Interest expense        
Derivative Instruments, Gain (Loss)        
Gains/(losses) of total hedge activity 8 (35) 24 (96)
Services        
Derivative Instruments, Gain (Loss)        
Cost 7,357 7,840 22,720 24,293
Sales        
Derivative Instruments, Gain (Loss)        
Cost 1,601 1,635 4,964 4,979
Financing        
Derivative Instruments, Gain (Loss)        
Cost $ 172 $ 217 $ 517 $ 710