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Other Current and Non-current Liabilities - Changes in Consolidated Other Current and Non-current Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
Balance at beginning of period $ 1,756 $ 1,524
Additions or increase in estimates 2,773 2,397
Releases or decrease in estimates (2,538) (2,168)
Reclassifications 4 113
Accretion expense (28) (122)
Foreign currency translation (10) 12
Balance at end of period 1,957 1,756
Current provisions 659 759
Asset retirement obligations [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 369  
Additions or increase in estimates 267  
Releases or decrease in estimates (62)  
Reclassifications (19)  
Accretion expense (1)  
Foreign currency translation (1)  
Balance at end of period 553 369
Environmental liability [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 275  
Additions or increase in estimates 1  
Releases or decrease in estimates (2)  
Foreign currency translation 2  
Balance at end of period 276 275
Legal proceedings provision [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 27  
Additions or increase in estimates 31  
Releases or decrease in estimates (9)  
Reclassifications 17  
Accretion expense (1)  
Foreign currency translation (17)  
Balance at end of period 48 27
Valuation derivative instruments [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 91  
Releases or decrease in estimates (23)  
Foreign currency translation (31)  
Balance at end of period 37 91
Current provisions 7  
Other liabilities and provisions [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 994  
Additions or increase in estimates 2,474  
Releases or decrease in estimates (2,442)  
Reclassifications 6  
Accretion expense (26)  
Foreign currency translation 37  
Balance at end of period 1,043 $ 994
Current provisions $ 652