Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss)
Cost	$ 6,548	$ 6,729	$ 20,087	$ 20,446
SG&A expense	4,911	4,458	14,823	14,212
Other (income) and expense	2,244	(215)	1,694	(721)
Interest expense	429	412	1,288	1,202
Cost of services
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	5	(2)	19	(6)
Cost of sales
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	3	(5)	30	12
Cost of financing
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(2)	(3)	(9)	(10)
SG&A expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	83	(58)	168	44
Other (income) and expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	428	(316)	1	(315)
Interest expense
Derivative Instruments, Gain (Loss)
Gains/(losses) of total hedge activity	(11)	(15)	(45)	(46)
Services
Derivative Instruments, Gain (Loss)
Cost	5,048	5,217	15,414	15,821
Sales
Derivative Instruments, Gain (Loss)
Cost	1,404	1,419	4,393	4,329
Financing
Derivative Instruments, Gain (Loss)
Cost	$ 95	$ 94	$ 281	$ 297