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Intangible and tangible assets - Intangible assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 14,587 $ 15,362 $ 14,549 $ 14,682
Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill 1,427 1,157 626  
Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 5,407 6,362 6,364  
Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 6,362 6,452 6,669  
Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 1,391 1,391 890  
Other intangible assets | Low        
Goodwill and other intangible assets        
Finite useful life 3 years      
Other intangible assets | High        
Goodwill and other intangible assets        
Finite useful life 20 years      
Gross value/Cost        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ 32,040 31,270 30,207  
Gross value/Cost | Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill 2,442 2,159 1,597  
Gross value/Cost | Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 13,081 13,347 12,800  
Gross value/Cost | Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill 11,686 11,582 11,751  
Gross value/Cost | Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill 4,831 4,182 4,059  
Depreciation, amortization and impairment        
Goodwill and other intangible assets        
Intangible assets, including goodwill (17,453) (15,908) (15,658)  
Depreciation, amortization and impairment | Goodwill        
Goodwill and other intangible assets        
Intangible assets, including goodwill (1,015) (1,002) (971)  
Depreciation, amortization and impairment | Proved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill (7,674) (6,985) (6,436)  
Depreciation, amortization and impairment | Unproved mineral interests        
Goodwill and other intangible assets        
Intangible assets, including goodwill (5,324) (5,130) (5,082)  
Depreciation, amortization and impairment | Other intangible assets        
Goodwill and other intangible assets        
Intangible assets, including goodwill $ (3,440) $ (2,791) $ (3,169)