Derivative Financial Instruments - Gains and Losses (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)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost, Interest expense, Selling, general and administrative, Other (income) and expense	Cost, Interest expense, Selling, general and administrative, Other (income) and expense	Cost, Interest expense, Selling, general and administrative, Other (income) and expense	Cost, Interest expense, Selling, general and administrative, Other (income) and expense
(Gains)/losses recognized on derivatives	$ 0	$ (463)	$ (451)	$ 46
(Gains)/losses recognized in earnings attributable to risk being hedged	27	222	146	79
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI	179	(1,290)	(2,356)	(131)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	66	(254)	(732)	(263)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing	(4)	(11)	(1)	(26)
Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Cash flow hedges	0	0	0	0
Foreign exchange contracts | Not Designated as Hedging Instrument, Economic Hedge
Derivative Instruments, Gain (Loss)
(Gains)/losses recognized on derivatives	83	(194)	(202)	174
Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Cash flow hedges	70	(153)	87	147
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Amount excluded from the assessment of effectiveness	(50)	(62)	(207)	(84)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing	28	20	84	57
Foreign exchange contracts | Net Investment Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Amount excluded from the assessment of effectiveness	6	10	17	10
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Recognized in OCI - Net investment hedges	154	(1,086)	(2,252)	(205)
Equity contracts | Not Designated as Hedging Instrument, Economic Hedge
Derivative Instruments, Gain (Loss)
(Gains)/losses recognized on derivatives	(75)	(83)	(156)	(158)
Cost of financing | Interest rate contracts | Fair Value Hedging
Derivative Instruments, Gain (Loss)
(Gains)/losses recognized on derivatives	(1)	(31)	(14)	5
(Gains)/losses recognized in earnings attributable to risk being hedged	4	37	23	13
Cost of financing | Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	1	1	2	2
Cost of financing | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	1	1	2	3
Cost of financing | Foreign exchange contracts | Net Investment Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing	(5)	(5)	(13)	(14)
Interest expense | Interest rate contracts | Fair Value Hedging
Derivative Instruments, Gain (Loss)
(Gains)/losses recognized on derivatives	(6)	(155)	(79)	24
(Gains)/losses recognized in earnings attributable to risk being hedged	22	185	123	66
Interest expense | Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	3	3	9	10
Interest expense | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	3	5	9	15
Interest expense | Foreign exchange contracts | Net Investment Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Amounts Excluded from Effectiveness Testing	(26)	(26)	(72)	(69)
Cost of services | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	7	(5)	12	(19)
Cost of sales | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	0	(3)	(2)	(30)
SG&A expense | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	1	0	(1)	(10)
Other (income) and expense | Foreign exchange contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss)
(Gains)/Losses Recognized in Earnings and Other Comprehensive Income - Reclassified from AOCI	$ 51	$ (255)	$ (763)	$ (233)