Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Accumulated other comprehensive income/(loss) (Note 23)	$ (9,639)	$ (9,042)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	(1)	1	$ (4)
Derivative instruments
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	281
Parent Company [Member]
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Accumulated other comprehensive income/(loss) (Note 23)	(9,639)	(9,042)	(9,339)
Foreign currency translation
Beginning balance	(5,443)	(6,416)	(5,487)
Gains/(Losses) on foreign currency translation	(1,336)	967	(1,199)
Less: Tax/(Tax benefit) (a)	77	(10)	(2)
Net gains/(losses) on foreign currency translation	(1,413)	977	(1,197)
(Gains)/Losses reclassified from AOCI to net income	(43)	(4)	268
Other comprehensive income/(loss), net of tax (b)	(1,456)	973	(929)
Ending balance	(6,899)	(5,443)	(6,416)
Marketable securities
Beginning balance	(170)	(442)	(19)
Gains/(Losses) on available for sale securities	146	326	(576)
Less: Tax/(Tax benefit)	34	80	(139)
Net gains/(losses) on available for sale securities	112	246	(437)
(Gains)/Losses reclassified from AOCI to net income	11	35	19
Less: Tax/(Tax benefit)	3	9	5
Net (gains)/losses reclassified from AOCI to net income (c)	8	26	14
Other comprehensive income/(loss), net of tax	120	272	(423)
Ending balance	(50)	(170)	(442)
Derivative instruments
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(331)	129	(193)
Gains/(Losses) on derivative instruments	803	(519)	346
Less: Tax/(Tax benefit)	188	(126)	83
Net gains/(losses) on derivative instruments	615	(393)	263
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(8)	(83)	80
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(1)	(16)	21
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(7)	(67)	59
Other comprehensive income/(loss), net of tax	608	(460)	322
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	277	(331)	129
Pension and other postretirement benefits
Beginning balance	(3,098)	(2,610)	(2,640)
Prior service (costs)/credits arising during the period (e)	0	(659)	0
Less: Tax/(Tax benefit)	0	(157)	0
Net prior service (costs)/credits arising during the period	0	(502)	0
Amortization and recognition of prior service costs/(credits) (f)	167	25	21
Less: Tax/(Tax benefit)	40	6	4
Net prior service costs/(credits) reclassified from AOCI to net income	127	19	17
Translation impact on non-U.S. plans	4	(5)	13
Other comprehensive income/(loss), net of tax	131	(488)	30
Ending balance	$ (2,967)	$ (3,098)	$ (2,610)