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Provisions and other liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period $ 15,952
Current portion, reported as trade, other payables and provisions, beginning 224
Provisions and other liabilities at the beginning period 16,175
New or increased provisions and other liabilities 1,692
Change in estimates (253)
Amounts charged against provisions and other liabilities (485)
Effects of change in the discount rate 1,828
Reduction due to divestments (175)
Accretion expenses 456
Reclassification and transfer 21
Currency translation (96)
Provisions and other liabilities at ending period 19,163
Current portion, reported as trade, other payables and provisions, ending 1,211
Non-current portion - ending period 17,951
Asset retirement obligations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 12,544
Current portion, reported as trade, other payables and provisions, beginning 65
Provisions and other liabilities at the beginning period 12,609
New or increased provisions and other liabilities 563
Change in estimates (115)
Amounts charged against provisions and other liabilities (218)
Effects of change in the discount rate 1,779
Reduction due to divestments (175)
Accretion expenses 456
Reclassification and transfer (92)
Currency translation (88)
Provisions and other liabilities at ending period 14,719
Current portion, reported as trade, other payables and provisions, ending 104
Non-current portion - ending period 14,616
Claims and litigations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 905
Current portion, reported as trade, other payables and provisions, beginning 56
Provisions and other liabilities at the beginning period 961
New or increased provisions and other liabilities (2)
Change in estimates 5
Amounts charged against provisions and other liabilities 0
Effects of change in the discount rate 0
Reduction due to divestments 0
Accretion expenses 0
Reclassification and transfer 0
Currency translation 0
Provisions and other liabilities at ending period 965
Current portion, reported as trade, other payables and provisions, ending 910
Non-current portion - ending period 54
Other provisions [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 2,503
Current portion, reported as trade, other payables and provisions, beginning 103
Provisions and other liabilities at the beginning period 2,606
New or increased provisions and other liabilities 1,130
Change in estimates (143)
Amounts charged against provisions and other liabilities (268)
Effects of change in the discount rate 49
Reduction due to divestments 0
Accretion expenses 0
Reclassification and transfer 113
Currency translation (9)
Provisions and other liabilities at ending period 3,479
Current portion, reported as trade, other payables and provisions, ending 197
Non-current portion - ending period $ 3,282