Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 18,256	$ 15,759	$ 15,891	$ 16,516
Total other comprehensive income (loss), net of tax	(286)	(854)	225	(1,800)
Ending balance	20,507	15,622	20,507	15,622
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,863)	(2,282)	(2,328)	(1,508)
Gains (losses) on foreign currency translation	(194)	(592)	(235)	(1,328)
Less: Tax provision /(benefit)	10	26	(2)	64
Net gains (losses) on foreign currency translation	(204)	(618)	(233)	(1,392)
(Gains) losses reclassified to earnings	(1)	0	493	0
Less: Tax provision /(benefit)	0	0	0	0
Net (gains) losses reclassified to earnings	(1)	0	493	0
Total other comprehensive income (loss), net of tax	(205)	(618)	260	(1,392)
Ending balance	(2,068)	(2,900)	(2,068)	(2,900)
Pension and other postretirement benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(44)	(64)	(39)	(62)
Gains (losses) on foreign currency translation	0	0	0	0
Less: Tax provision /(benefit)	0	0	0	0
Net gains (losses) on foreign currency translation	0	0	0	0
(Gains) losses reclassified to earnings	(3)	(1)	(9)	(4)
Less: Tax provision /(benefit)	0	0	(1)	(1)
Net (gains) losses reclassified to earnings	(3)	(1)	(8)	(3)
Total other comprehensive income (loss), net of tax	(3)	(1)	(8)	(3)
Ending balance	(47)	(65)	(47)	(65)
Derivative financial instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	71	(66)	28	(3)
Gains (losses) on foreign currency translation	13	44	57	298
Less: Tax provision /(benefit)	5	35	14	71
Net gains (losses) on foreign currency translation	8	9	43	227
(Gains) losses reclassified to earnings	(94)	(296)	(84)	(636)
Less: Tax provision /(benefit)	(24)	(96)	(22)	(155)
Net (gains) losses reclassified to earnings	(70)	(200)	(62)	(481)
Total other comprehensive income (loss), net of tax	(62)	(191)	(19)	(254)
Ending balance	9	(257)	9	(257)
Available-for-sale securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(110)	(87)	(118)	20
Gains (losses) on foreign currency translation	(22)	(55)	(12)	(188)
Less: Tax provision /(benefit)	(5)	(11)	(3)	(37)
Net gains (losses) on foreign currency translation	(17)	(44)	(9)	(151)
(Gains) losses reclassified to earnings	1	0	1	0
Less: Tax provision /(benefit)	0	0	0	0
Net (gains) losses reclassified to earnings	1	0	1	0
Total other comprehensive income (loss), net of tax	(16)	(44)	(8)	(151)
Ending balance	(126)	(131)	(126)	(131)
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,946)	(2,499)	(2,457)	(1,553)
Ending balance	$ (2,232)	$ (3,353)	$ (2,232)	$ (3,353)