Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss)
Cost	$ 6,862	$ 6,160	[1]
SG&A expense	4,597	4,688	[1]
Other (income) and expense	246	346	[1]
Interest expense	311	280	[1]
Cost of services
Derivative Instruments, Gain (Loss)
Cost	5,349	4,644
Gains/(losses) of total hedge activity	15	14
Cost of sales
Derivative Instruments, Gain (Loss)
Cost	1,415	1,379
Gains/(losses) of total hedge activity	12	(22)
Cost of financing
Derivative Instruments, Gain (Loss)
Cost	98	137
Gains/(losses) of total hedge activity	(2)	2
SG&A expense
Derivative Instruments, Gain (Loss)
SG&A expense	4,597	4,688
Gains/(losses) of total hedge activity	(70)	34
Other (income) and expense
Derivative Instruments, Gain (Loss)
Other (income) and expense	246	346
Gains/(losses) of total hedge activity	(102)	(160)
Interest expense
Derivative Instruments, Gain (Loss)
Interest expense	311	280
Gains/(losses) of total hedge activity	$ (6)	$ 5

[1] Reclassified to reflect discontinued operations presentation.