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Intangible and tangible assets - Intangible assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 33,528 $ 33,178 $ 28,922 $ 14,587
Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill 8,807 8,346 8,174  
Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 6,964 7,225 6,828  
Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 15,510 15,580 12,221  
Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 2,247 2,027 1,699  
Other intangible assets | Minimum        
Goodwill and other intangible assets        
Finite useful life 3 years      
Other intangible assets | Maximum        
Goodwill and other intangible assets        
Finite useful life 20 years      
Gross value/Cost        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 53,809 51,204 46,499  
Gross value/Cost | Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill 9,738 9,357 9,188  
Gross value/Cost | Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 16,559 15,966 14,775  
Gross value/Cost | Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 20,300 20,138 16,712  
Gross value/Cost | Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill 7,212 5,743 5,824  
Depreciation, amortization and impairment        
Goodwill and other intangible assets        
Intangible assets, including goodwill (20,281) (18,026) (17,577)  
Depreciation, amortization and impairment | Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill (931) (1,011) (1,014)  
Depreciation, amortization and impairment | Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill (9,595) (8,741) (7,947)  
Depreciation, amortization and impairment | Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill (4,790) (4,558) (4,491)  
Depreciation, amortization and impairment | Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ (4,965) $ (3,716) $ (4,125)