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Financial instruments - Sensitivity analysis of market risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) derivative financial instruments $ 473 $ (341) $ (61)
Commodity price sensitivity [member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk (30.00%) (30.00%)  
Commodity price sensitivity [member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 30.00% 30.00%  
Commodity price sensitivity [member] | Crude oil and refined products [member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) derivative financial instruments $ 569 $ 275  
Commodity price sensitivity [member] | Crude oil and refined products [member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) derivative financial instruments (563) (230)  
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) derivative financial instruments (33) 1,157  
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Gains (losses) derivative financial instruments $ 49 $ (1,156)  
Equity price risk [member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk (35.00%)    
Net gains (losses) $ (631)    
Equity price risk [member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 35.00%    
Net gains (losses) $ 631    
Currency risk sensitivity [member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk (9.00%) (9.00%)  
Currency risk sensitivity [member] | Minimum (%) [member] | United States Dollar (USD) [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Foreign exchange gain (loss) $ (220) $ (230)  
Currency risk sensitivity [member] | Minimum (%) [member] | Norwegian kroner (NOK) [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Foreign exchange gain (loss) $ 282 $ 311  
Currency risk sensitivity [member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 9.00% 9.00%  
Currency risk sensitivity [member] | Maximum (%) [member] | United States Dollar (USD) [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Foreign exchange gain (loss) $ 220 $ 230  
Currency risk sensitivity [member] | Maximum (%) [member] | Norwegian kroner (NOK) [Member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Foreign exchange gain (loss) $ (282) $ (311)  
Interest rate sensitivity [member] | Minimum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk (0.60%) (0.60%)  
Net gains (losses) $ 526 $ 575  
Interest rate sensitivity [member] | Maximum (%) [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Percentage of reasonably possible change, market risk 0.60% 0.60%  
Net gains (losses) $ (526) $ (575)