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	Dec. 31, 2022
Derivative instruments [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ 97
Pension and other postretirement benefits
Total AOCI ending balance at September 30	$ (8,933)		(8,933)		$ (9,339)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	(2)	$ 3	2	$ (1)
Parent Company [Member]
Foreign currency transaction [Abstract]
Beginning balance	(5,649)	(6,355)	(6,416)	(5,487)
Gains/(Losses) on foreign currency translation	(368)	(996)	393	(2,063)
Less: Tax/(Tax benefit) (a)	(1)	36	(11)	5
Net gains/(losses) on foreign currency translation	(367)	(1,032)	404	(2,068)
(Gains)/Losses reclassified from AOCI to income	(2)	80	(6)	248
Other comprehensive income/(loss), net of tax (c)	(369)	(952)	398	(1,820)
Ending balance	(6,018)	(7,307)	(6,018)	(7,307)
Marketable securities [Abstract]
Beginning balance	(376)	(355)	(442)	(19)
Gains/(Losses) on available for sale securities	30	(199)	98	(647)
Less: Tax/(Tax benefit)	7	(47)	24	(153)
Net gains/(losses) on available for sale securities	23	(152)	74	(494)
(Gains)/Losses reclassified from AOCI to net income	6	5	26	13
Less: Tax/(Tax benefit)	1	1	6	3
Net (gains)/losses reclassified from AOCI to net income (b)	5	4	20	10
Other comprehensive income/(loss), net of tax	28	(148)	94	(484)
Ending balance	(348)	(503)	(348)	(503)
Derivative instruments [Abstract]
Beginning balance	(295)	(143)	129	(193)
Gains/(losses) on derivative instruments	430	445	(61)	475
Less: Tax/(tax benefit)	111	105	(16)	112
Net gains/(losses) on derivative instruments	319	340	(45)	363
(Gains)/Losses reclassified from AOCI to net income	(3)	35	(69)	73
Less: Tax/(tax benefit)	(9)	8	(15)	19
Net (gains)/losses reclassified to AOCI from net income	6	27	(54)	54
Other comprehensive income/(loss), net of tax	325	367	(99)	417
Ending balance	30	224	30	224
Pension and other postretirement benefits
Beginning balance	(2,604)	(2,620)	(2,610)	(2,640)
Amortization of prior service costs/(credits)	8	5	20	17
Less: Tax/(Tax benefit)	2	1	5	4
Net prior service costs/(credits) reclassified from AOCI to net income	6	4	15	13
Translation impact on non-U.S. plans	1	9	(2)	20
Other comprehensive income/(loss), net of tax	7	13	13	33
Ending balance	(2,597)	(2,607)	(2,597)	(2,607)
Total AOCI ending balance at September 30	$ (8,933)	$ (10,193)	$ (8,933)	$ (10,193)