XML 521 R137.htm IDEA: XBRL DOCUMENT v3.21.1
Financial instruments related to commodity contracts - Fair value hierarchy (Details) - Derivative financial instruments related to commodity contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments $ (2,238) $ (542) $ (698)  
Active management horizon of assessment 12 months 12 months    
Level 1        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments $ (149) $ 210 121  
Level 2        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (681) 1,882 (618)  
Level 3        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (1,408) (2,634) (201)  
Crude oil, petroleum products and freight rates activities        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (310) (282) (283) $ (223)
Crude oil, petroleum products and freight rates activities | Level 1        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments 10 (182) (303)  
Crude oil, petroleum products and freight rates activities | Level 2        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (320) (172) 20  
Crude oil, petroleum products and freight rates activities | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments   72    
Integrated Gas, Renewables & Power activities        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (1,928) (260) (415) $ 416
Integrated Gas, Renewables & Power activities | Level 1        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (159) 392 424  
Integrated Gas, Renewables & Power activities | Level 2        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments (361) 2,054 (638)  
Integrated Gas, Renewables & Power activities | Level 3        
Disclosure of detailed information about financial instruments [line items]        
Fair value of financial instruments $ (1,408) $ (2,706) $ (201)  
Price risk resulting from volatility of oil and natural gas prices        
Disclosure of detailed information about financial instruments [line items]        
Reasonably possible increase in risk assumption (as a percent) 10.00%      
Reasonably possible decrease in risk assumption (as a percent) (10.00%)      
Increase in following year's margin due to increase in gas price spread $ 100      
Decrease in following year's margin due to decrease in gas price spread $ (100)