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Provisions and other liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period $ 22,568 [1]
Current portion, reported as trade, other payables and provisions, beginning 2,649
Provisions and other liabilities at the beginning period 25,216
New or increased provisions and other liabilities 984
Change in estimates (1,296)
Amounts charged against provisions and other liabilities (1,519)
Effects of change in the discount rate (1,623)
Reduction due to divestments (359)
Accretion expenses 452
Reclassification and transfer 224
Currency translation (476)
Provisions and other liabilities at ending period 21,603
Non-current portion - ending period 19,899 [1]
Current portion, reported as trade, other payables and provisions, ending 1,704
Before restatement [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 19,731
Impact of ARO policy change [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 2,837
Non-current portion - ending period 1,751
Asset retirement obligations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 20,037
Current portion, reported as trade, other payables and provisions, beginning 92
Provisions and other liabilities at the beginning period 20,128
New or increased provisions and other liabilities 602
Change in estimates (1,097)
Amounts charged against provisions and other liabilities (125)
Effects of change in the discount rate (1,610)
Reduction due to divestments (359)
Accretion expenses 423
Reclassification and transfer (74)
Currency translation (471)
Provisions and other liabilities at ending period 17,417
Non-current portion - ending period 17,279
Current portion, reported as trade, other payables and provisions, ending 138
Asset retirement obligations [Member] | Before restatement [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 17,200
Asset retirement obligations [Member] | Impact of ARO policy change [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 2,837
Claims and litigations [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 96
Current portion, reported as trade, other payables and provisions, beginning 958
Provisions and other liabilities at the beginning period 1,053
New or increased provisions and other liabilities 30
Change in estimates (58)
Amounts charged against provisions and other liabilities (870)
Reclassification and transfer 0
Currency translation 0
Provisions and other liabilities at ending period 155
Non-current portion - ending period 81
Current portion, reported as trade, other payables and provisions, ending 73
Claims and litigations [Member] | Before restatement [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 96
Claims and litigations [Member] | Impact of ARO policy change [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 0
Other provisions [Member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 2,436
Current portion, reported as trade, other payables and provisions, beginning 1,600
Provisions and other liabilities at the beginning period 4,035
New or increased provisions and other liabilities 352
Change in estimates (141)
Amounts charged against provisions and other liabilities (524)
Effects of change in the discount rate (13)
Accretion expenses 29
Reclassification and transfer 298
Currency translation (5)
Provisions and other liabilities at ending period 4,031
Non-current portion - ending period 2,539
Current portion, reported as trade, other payables and provisions, ending 1,493
Other provisions [Member] | Before restatement [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period 2,436
Other provisions [Member] | Impact of ARO policy change [member]  
Disclosure of other provisions and other liabilities [line items]  
Non-current portion - beginning period $ 0
[1]
1) Restated 1 January 2020 and 31 December
 
2020 figures due to a policy change affecting ARO,
 
see note 2 Significant accounting policies
and note 21 Provisions and other liabilities.