XML 192 R140.htm IDEA: XBRL DOCUMENT v3.21.1
Other Current and Non-current Liabilities - Changes in Consolidated Other Current and Non-current Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Balance at beginning of period $ 1,524 $ 1,335
Additions or increase in estimates 2,397 1,641
Releases or decrease in estimates (2,168) (1,527)
Reclassifications 113 62
Accretion expense (122) (59)
Foreign currency translation 12 72
Balance at end of period 1,756 1,524
Current provisions 759 599
Asset retirement obligations [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 327  
Additions or increase in estimates 80  
Releases or decrease in estimates (28)  
Reclassifications 54  
Accretion expense (17)  
Foreign currency translation (47)  
Balance at end of period 369 327
Environmental liability [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 214  
Additions or increase in estimates 1  
Accretion expense 62  
Foreign currency translation (2)  
Balance at end of period 275 214
Legal proceedings provision [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 30  
Additions or increase in estimates 3  
Releases or decrease in estimates (8)  
Foreign currency translation 2  
Balance at end of period 27 30
Valuation derivative instruments [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 102  
Additions or increase in estimates 7  
Foreign currency translation (18)  
Balance at end of period 91 102
Current provisions 38  
Other liabilities and provisions [Member]    
Disclosure of other provisions [line items]    
Balance at beginning of period 851  
Additions or increase in estimates 2,306  
Releases or decrease in estimates (2,132)  
Reclassifications 59  
Accretion expense (167)  
Foreign currency translation 77  
Balance at end of period 994 $ 851
Current provisions $ 721