Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Derivative instruments [Abstract]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 147
Pension and other postretirement benefits
Total AOCI ending balance at March 31	(8,788)		$ (9,339)
Parent Company [Member]
Foreign currency transaction [Abstract]
Beginning balance	(6,416)	$ (5,487)
Gains/(Losses) on foreign currency translation	485	(71)
Less: Tax/(Tax benefit) (a)	(10)	(96)
Net gains/(losses) on foreign currency translation	495	25
(Gains)/Losses reclassified from AOCI to income	(2)	121
Other comprehensive income/(loss), net of tax	493	146
Ending balance	(5,923)	(5,341)
Marketable securities [Abstract]
Beginning balance	(442)	(19)
Gains/(Losses) on available for sale securities	135	(330)
Less: Tax/(Tax benefit)	33	(77)
Net gains/(losses) on available for sale securities	102	(253)
(Gains)/Losses reclassified from AOCI to net income	11	0
Less: Tax/(Tax benefit)	3	0
Net (gains)/losses reclassified from AOCI to net income	8	0
Other comprehensive income/(loss), net of tax	110	(253)
Ending balance	(332)	(272)
Derivative instruments [Abstract]
Beginning balance	129	(193)
Gains/(losses) on derivative instruments	(55)	156
Less: Tax/(tax benefit)	(14)	37
Net gains/(losses) on derivative instruments	(41)	119
(Gains)/Losses reclassified from AOCI to net income	(17)	32
Less: Tax/(tax benefit)	(3)	7
Net (gains)/losses reclassified to AOCI from net income	(14)	25
Other comprehensive income/(loss), net of tax	(55)	144
Ending balance	74	(49)
Pension and other postretirement benefits
Beginning balance	(2,610)	(2,640)
Amortization of prior service costs/(credits)	6	6
Less: Tax/(Tax benefit)	1	1
Net prior service costs/(credits) reclassified from AOCI to net income	5	5
Translation impact on non-U.S. plans	(2)	3
Other comprehensive income/(loss), net of tax	3	8
Ending balance	(2,607)	(2,632)
Total AOCI ending balance at March 31	$ (8,788)	$ (8,294)