Fixed Assets - Summary of Fixed Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Fixed assets gross	$ 29,965	$ 28,386
Less: Accumulated depreciation	22,725	21,779
Fixed assets less accumulated depreciation	7,240	6,607
Land
Property Plant And Equipment [Line Items]
Fixed assets gross	323	326
Buildings & improvements
Property Plant And Equipment [Line Items]
Fixed assets gross	4,569	4,328
Machinery & equipment
Property Plant And Equipment [Line Items]
Fixed assets gross	$ 25,073	$ 23,732