Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss)
Cost	$ 6,719	$ 6,743
SG&A expense	4,974	4,853
Other (income) and expense	(317)	(245)
Interest expense	432	367
Cost of services
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	4	(2)
Cost of sales
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	12	14
Cost of financing
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(3)	(3)
SG&A expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	74	59
Other (income) and expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(287)	142
Interest expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(15)	(14)
Services
Derivative Instruments, Gain (Loss)
Cost	5,239	5,310
Sales
Derivative Instruments, Gain (Loss)
Cost	1,381	1,322
Financing
Derivative Instruments, Gain (Loss)
Cost	$ 99	$ 110