Derivative Financial Instruments - Effect of Hedge Activity on Income and Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	$ 162	$ (428)	$ (881)	$ (1)
Cost of services
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	7	(5)	12	(19)
Cost of sales
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	0	(3)	(2)	(30)
Cost of financing
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	(1)	2	(2)	9
SG&A expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	(74)	(83)	(157)	(168)
Other (income) and expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	162	(428)	(881)	(1)
Interest expense
Derivative Instruments, Gain (Loss)
(Gains)/Losses of Total Hedge Activity	$ (4)	$ 11	$ (9)	$ 45