Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Accumulated other comprehensive income/(loss) (Note 23)	$ (8,339)	$ (8,294)
Derivative instruments
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	116
Parent Company [Member]
Accumulated Other Comprehensive Income/(Loss) [Line Items]
Accumulated other comprehensive income/(loss) (Note 23)	(8,339)	(8,294)	$ (7,728)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	4
Foreign currency translation
Beginning balance	(5,526)	(4,626)	(4,800)
Gains/(Losses) on foreign currency translation	200	(1,107)	181
Less: Tax/(Tax benefit) (a)	143	(206)	6
Net gains/(losses) on foreign currency translation	57	(901)	175
(Gains)/Losses reclassified from AOCI to net income (b)	(18)	1	(1)
Other comprehensive income/(loss), net of tax (c)	39	(900)	174
Ending balance	(5,487)	(5,526)	(4,626)
Marketable securities
Beginning balance	156	71	(59)
Gains/(Losses) on available for sale securities	(209)	155	173
Less: Tax/(Tax benefit)	(52)	37	40
Net gains/(losses) on available for sale securities	(157)	118	133
(Gains)/Losses reclassified from AOCI to net income	(23)	(45)	(3)
Less: Tax/(Tax benefit)	(5)	(12)	0
Net (gains)/losses reclassified from AOCI to net income	(18)	(33)	(3)
Other comprehensive income/(loss), net of tax	(175)	85	130
Ending balance	(19)	156	71
Derivative instruments
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(266)	(488)	201
Gains/(Losses) on derivative instruments	(169)	207	(875)
Less: Tax/(Tax benefit)	(20)	39	(180)
Net gains/(losses) on derivative instruments	(149)	168	(695)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	280	66	3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	58	12	(3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	222	54	6
Other comprehensive income/(loss), net of tax	73	222	(689)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(193)	(266)	(488)
Pension and other postretirement benefits
Beginning balance	(2,658)	(2,685)	(2,708)
Prior service (costs)/credits arising during the period	0	(21)	(15)
Less: Tax/(Tax benefit)	0	(6)	(2)
Net prior service (costs)/credits arising during the period	0	(15)	(13)
Amortization and recognition of prior service costs/(credits) (e)	27	63	50
Less: Tax/(Tax benefit)	6	10	10
Net prior service costs/(credits) reclassified from AOCI to net income	21	53	40
Translation impact on non-U.S. plans	(3)	(11)	(4)
Other comprehensive income/(loss), net of tax	18	27	23
Ending balance	$ (2,640)	$ (2,658)	$ (2,685)