Property, Plant and Equipment (PP&E) - Components of Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	$ 29,955	$ 28,406
Less: Accumulated depreciation	15,074	14,661
Property, plant and equipment	14,882	13,745
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	423	443
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	9,001	8,998
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	12,252	11,000
Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	4,457	4,484
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment before accumulated depreciation	$ 3,822	$ 3,481
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	33 years
Minimum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	8 years
Minimum [Member] | Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	3 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	50 years
Maximum [Member] | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	20 years
Maximum [Member] | Furniture, fixtures and other [Member]
Property, Plant and Equipment [Line Items]
Useful lives (years)	12 years 6 months