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Fixed Assets - Summary of Fixed Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Fixed assets gross $ 29,077 $ 29,744
Less: Accumulated depreciation 22,648 22,918
Fixed assets less accumulated depreciation 6,429 6,826
Land    
Property Plant And Equipment [Line Items]    
Fixed assets gross 372 362
Buildings & improvements    
Property Plant And Equipment [Line Items]    
Fixed assets gross 4,371 3,757
Machinery & equipment    
Property Plant And Equipment [Line Items]    
Fixed assets gross $ 24,334 $ 25,625