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Provisions and other liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Disclosure of other provisions and other liabilities [line items]  
Provisions and other liabilities at the beginning period $ 19,163
Non-current portion - beginning period 17,951
Current portion, reported as trade, other payables and provisions, beginning 1,211
New or increased provisions and other liabilities 873
Change in estimates 214
Amounts charged against provisions and other liabilities (394)
Effects of change in the discount rate 1,569
Reduction due to divestments 0
Accretion expenses 572
Reclassification and transfer (254)
Currency translation 637
Provisions and other liabilities at ending period 22,380
Non-current portion - ending period 19,731
Current portion, reported as trade, other payables and provisions, ending 2,649
Asset retirement obligations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Provisions and other liabilities at the beginning period 14,719
Non-current portion - beginning period 14,616
Current portion, reported as trade, other payables and provisions, beginning 104
New or increased provisions and other liabilities 353
Change in estimates 202
Amounts charged against provisions and other liabilities (234)
Effects of change in the discount rate 1,537
Reduction due to divestments 0
Accretion expenses 412
Reclassification and transfer (282)
Currency translation 584
Provisions and other liabilities at ending period 17,292
Non-current portion - ending period 17,200
Current portion, reported as trade, other payables and provisions, ending 92
Claims and litigations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Provisions and other liabilities at the beginning period 965
Non-current portion - beginning period 54
Current portion, reported as trade, other payables and provisions, beginning 910
New or increased provisions and other liabilities 81
Change in estimates 22
Amounts charged against provisions and other liabilities (15)
Reclassification and transfer 0
Currency translation 0
Provisions and other liabilities at ending period 1,053
Non-current portion - ending period 96
Current portion, reported as trade, other payables and provisions, ending 958
Other provisions [Member]  
Disclosure of other provisions and other liabilities [line items]  
Provisions and other liabilities at the beginning period 3,479
Non-current portion - beginning period 3,282
Current portion, reported as trade, other payables and provisions, beginning 197
New or increased provisions and other liabilities 439
Change in estimates (10)
Amounts charged against provisions and other liabilities (145)
Effects of change in the discount rate 32
Accretion expenses 160
Reclassification and transfer 28
Currency translation 53
Provisions and other liabilities at ending period 4,035
Non-current portion - ending period 2,436
Current portion, reported as trade, other payables and provisions, ending $ 1,600