Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	$ 423	$ (442)
Cost of services
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	15	2
Cost of sales
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	(1)	(8)
Cost of financing
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	(1)	0
SG&A expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	67	31
Other (income) and expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	423	(442)
Interest expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	$ (5)	$ (2)