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Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Charges And Credits [Line Items]            
Charges and credits, Pretax   $ 12,901 $ 1,025 $ 50 $ 141 $ 3,764
Charges and credits, Tax   710     17 140
Charges and credits, Noncontolling interests           34
Charges and credits, Net   12,191     124 3,590
Promissory Note Fair Value Adjustment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax       $ 460   510
Charges and credits, Noncontolling interests           12
Charges and credits, Net           498
Cost of Sale            
Charges And Credits [Line Items]            
Charges and credits, Pretax           245
Merger and Integration            
Charges And Credits [Line Items]            
Charges and credits, Pretax           308
US tax reform charge            
Charges And Credits [Line Items]            
Charges and credits, Tax           (76)
Charges and credits, Net           76
North America restructuring | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax $ 225          
Charges and credits, Tax 51          
Charges and credits, Net 174          
North America pressure pumping asset impairments | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   1,575        
Charges and credits, Tax   344        
Charges and credits, Net   1,231        
Workforce reductions            
Charges And Credits [Line Items]            
Charges and credits, Pretax     247   184  
Charges and credits, Tax         20  
Charges and credits, Net         164  
Workforce reductions | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax 68         247
Charges and credits, Tax 8         13
Charges and credits, Net 60         234
Other North America - Related | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   310        
Charges and credits, Tax   53        
Charges and credits, Net   257        
Pension settlement accounting | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax 37          
Charges and credits, Tax 8          
Charges and credits, Net 29          
Argentina | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   127        
Charges and credits, Net   127        
Repurchase of bonds | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax 22          
Charges and credits, Tax 5          
Charges and credits, Net 17          
Equity Method Investment, Other Than Temporary Impairment | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   231        
Charges and credits, Tax   12        
Charges and credits, Net   219        
Gain on formation of Sensia joint venture | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax (247)          
Charges and credits, Tax (42)          
Charges and credits, Net (205)          
Goodwill impairment | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   8,828        
Charges and credits, Tax   43        
Charges and credits, Net   8,785        
Other | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   242        
Charges and credits, Tax   13        
Charges and credits, Net   229        
Intangible assets impairment | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   1,085        
Charges and credits, Tax   248        
Charges and credits, Net   837        
Asset Performance Solutions | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax   294        
Charges and credits, Net   $ 294        
Gain on sale of marine seismic acquisition business            
Charges And Credits [Line Items]            
Charges and credits, Pretax         (215)  
Charges and credits, Tax         (19)  
Charges and credits, Net         (196)  
Asset Impairment Charges            
Charges And Credits [Line Items]            
Charges and credits, Pretax         172  
Charges and credits, Tax         16  
Charges and credits, Net         $ 156  
WesternGeco seismic restructuring charges | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax           1,114
Charges and credits, Tax           20
Charges and credits, Net           1,094
Venezuela investment write-down | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax           938
Charges and credits, Net           938
Multiclient seismic data impairment | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax           246
Charges and credits, Tax           81
Charges and credits, Net           165
Other restructuring charges            
Charges And Credits [Line Items]            
Charges and credits, Pretax     102      
Other restructuring charges | Impairment and Other            
Charges And Credits [Line Items]            
Charges and credits, Pretax 104         156
Charges and credits, Tax (33)         10
Charges and credits, Noncontolling interests           22
Charges and credits, Net $ 137         124
Provision for loss on long-term construction project            
Charges And Credits [Line Items]            
Charges and credits, Pretax     $ 245      
Provision for loss on long-term construction project | Cost of Sale            
Charges And Credits [Line Items]            
Charges and credits, Pretax           245
Charges and credits, Tax           22
Charges and credits, Net           223
Merger and integration-related costs | Merger and Integration            
Charges And Credits [Line Items]            
Charges and credits, Pretax           308
Charges and credits, Tax           70
Charges and credits, Net           $ 238