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Summary of Significant Accounting Policies - Principles of Consolidation, Shipping and Handling Costs, Inventories, & Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Principles of Consolidation [Abstract]      
Investments accounted for using the equity method, minimum interest 20.00%    
Investments accounted for using the equity method, maximum interest 50.00%    
Equity method investments included in other assets $ 56 $ 50  
Investments accounted for using the cost method, maximum interest 20.00%    
Property, Plant and Equipment [Line Items]      
Selling, general and administrative expenses $ 6,019 5,575 $ 5,389
Inventories [Abstract]      
Approximate percentage of inventories determined using the first-in, first-out (FIFO) method 75.00%    
Minimum | Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Maximum | Machinery and equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful life 15 years    
Maximum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated useful life 40 years    
Shipping and Handling      
Property, Plant and Equipment [Line Items]      
Selling, general and administrative expenses $ 1,392 $ 1,275 $ 1,255