Retirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined Contribution Plan, Cost	$ 155	$ 152	$ 152
Pension Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined Contribution Plan, Cost	546	478	432
Assumptions used to determine net benefit cost [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), (Gain) Loss Due to Settlement, Curtailment, and Other	$ 360	$ 544	244
Other Postretirement Benefit Plan, Defined Benefit
Weighted average assumptions [Abstract]
Discount Rate	5.10%	5.48%
Average rate of increase in compensation	3.98%	3.65%
Assumptions used to determine net benefit cost [Abstract]
Expected long-term rate of return on assets	0.00%	0.00%
Average rate of increase in compensation	3.65%	3.46%
Defined Benefit Plan, Other Cost (Credit)	$ 1	$ 0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	542	(1,130)	(212)
Service cost	21	42	49
Interest cost	231	146	127
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	0	0	0
Amortization of prior service costs/(credits)	3	(3)	(12)
Net remeasurement (gain)/loss	286	(1,314)	(376)
Settlements and curtailments	$ 0	$ (1)	0
Other Postretirement Benefit Plan Service Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	5.65%	3.27%
Other Postretirement Benefit Plan Interest Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	5.36%	2.49%
Non-U.S. Plans | Pension Plan
Weighted average assumptions [Abstract]
Discount Rate	3.98%	4.42%
Average rate of increase in compensation	3.54%	3.42%
Assumptions used to determine net benefit cost [Abstract]
Expected long-term rate of return on assets	4.13%	3.29%
Average rate of increase in compensation	3.42%	3.19%
Defined Benefit Plan, Other Cost (Credit)	$ 261	$ 63	156
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1,544	(439)	(3,216)
Service cost	245	416	557
Interest cost	965	504	420
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(890)	(1,006)	(1,130)
Amortization of prior service costs/(credits)	22	22	24
Net remeasurement (gain)/loss	932	(436)	(3,241)
Settlements and curtailments	$ 9	(2)	(2)
Non-U.S. Plans | Pension Plan | Other Restructuring
Assumptions used to determine net benefit cost [Abstract]
Defined Benefit Plan, Other Cost (Credit)		$ 57
Non-U.S. Plans | Foreign Pension Plan Service Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	4.29%	1.78%
Non-U.S. Plans | Foreign Pension Plan Interest Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	4.45%	1.54%
U.S. Plans | Pension Plan
Weighted average assumptions [Abstract]
Discount Rate	5.17%	5.51%
Average rate of increase in compensation	4.05%	3.70%
Assumptions used to determine net benefit cost [Abstract]
Expected long-term rate of return on assets	6.25%	5.75%
Average rate of increase in compensation	3.70%	3.50%
Defined Benefit Plan, Other Cost (Credit)	$ 20	$ 46	19
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	(71)	(438)	(70)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	966	1,191	(1,437)
Service cost	292	500	526
Interest cost	1,641	1,054	928
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(1,897)	(2,569)	(2,728)
Amortization of prior service costs/(credits)	0	2	2
Net remeasurement (gain)/loss	841	1,720	(254)
Settlements and curtailments	$ 69	$ 438	$ 70
U.S. Plans | United States Pension Plan US Entity Service Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	5.60%	3.12%
U.S. Plans | United States Pension Plan US Entity Interest Cost [Member]
Assumptions used to determine net benefit cost [Abstract]
Discount Rate	5.39%	2.40%