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Provisions and other liabilities - Restatement of ARO due to change in the discount rate (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions and other liabilities [line items]      
PPE $ 62,075 $ 68,508 $ 71,751
Total non-current assets 84,618 92,623 95,083
Total assets 147,120 124,809 119,861
Provisions and other liabilities [1] 19,899 22,568 19,750
Total non-current liabilities 68,959 71,097 59,144
Total liabilities 108,096 90,917 78,702
Before restatement [member]      
Disclosure of other provisions and other liabilities [line items]      
PPE   65,672 69,953
Total non-current assets   89,786 93,285
Total assets   121,972 118,063
Provisions and other liabilities   19,731 17,951
Total non-current liabilities   68,260 57,346
Total liabilities   88,081 76,904
Impact of ARO policy change [member]      
Disclosure of other provisions and other liabilities [line items]      
PPE 1,751 2,836 1,798
Total non-current assets   2,836 1,798
Total assets   2,836 1,798
Provisions and other liabilities $ 1,751 2,837 1,798
Total non-current liabilities   2,837 1,798
Total liabilities   $ 2,837 $ 1,798
[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.