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Fixed Assets - Summary of Fixed Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Fixed assets gross $ 38,664 $ 37,813
Less: Accumulated depreciation 26,985 26,237
Fixed assets less accumulated depreciation 11,679 11,576
Land    
Property Plant And Equipment [Line Items]    
Fixed assets gross 462 428
Buildings & improvements    
Property Plant And Equipment [Line Items]    
Fixed assets gross 5,534 5,122
Machinery & equipment    
Property Plant And Equipment [Line Items]    
Fixed assets gross $ 32,668 32,160
Seismic vessels    
Property Plant And Equipment [Line Items]    
Fixed assets gross   $ 103