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Implementation of IFRS16 Leases - consolidated statement of income under IFRS 16 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Total revenues and other income $ 64,357 $ 79,593 $ 61,187
Purchases (net of inventory variation) (29,532) (38,516) (28,212)
Operating expenses (9,660) (9,528) (8,763)
Selling, general and administrative expenses (809) (758) (738)
Depreciation, amortisation and net impairment losses (13,204) (9,249) (8,644)
Exploration expenses (1,854) (1,405) (1,059)
Net operating income/(loss) 9,299 20,137 13,771
Finance Income Cost (7) (1,263) (351)
Income / (loss) before tax 9,292 18,874 13,420
Income tax (7,441) (11,335) (8,822)
Net income/(loss) 1,851 $ 7,538 $ 4,598
IAS 17 [member]      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Total revenues and other income 64,127    
Purchases (net of inventory variation) (29,532)    
Operating expenses (10,179)    
Selling, general and administrative expenses (825)    
Depreciation, amortisation and net impairment losses (12,476)    
Exploration expenses (1,854)    
Net operating income/(loss) 9,261    
Finance Income Cost 87    
Income / (loss) before tax 9,348    
Income tax (7,421)    
Net income/(loss) 1,927    
IFRS 16 Adjustments [member]      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Total revenues and other income 230    
Purchases (net of inventory variation) 0    
Operating expenses 519    
Selling, general and administrative expenses 16    
Depreciation, amortisation and net impairment losses (728)    
Exploration expenses 0    
Net operating income/(loss) 38    
Finance Income Cost (94)    
Income / (loss) before tax (56)    
Income tax (20)    
Net income/(loss) $ (76)