Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss)
Cost	$ 6,510	$ 6,719
SG&A expense	4,886	4,974
Other (income) and expense	(165)	(317)
Interest expense	455	432
Gains/(losses) of total hedge activity	442	(287)
Cost of services
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(2)	4
Cost of sales
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	8	12
Cost of financing
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	0	(3)
SG&A expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(31)	74
Other (income) and expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	442	(287)
Interest expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	2	(15)
Services
Derivative Instruments, Gain (Loss)
Cost	5,002	5,239
Sales
Derivative Instruments, Gain (Loss)
Cost	1,404	1,381
Financing
Derivative Instruments, Gain (Loss)
Cost	$ 104	$ 99