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Pensions - Net pension cost (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of net defined benefit liability (asset) [abstract]      
Description of type of plan The main pension plans for Equinor ASA and its most significant subsidiaries are defined contribution plans, in which the pension costs are recognised in the Consolidated statement of income in line with payments of annual pension premiums. The pension contribution plans in Equinor ASA also includes certain unfunded elements (notional contribution plans), for which the annual notional contributions are recognised as pension liabilities.    
Description of nature of benefits provided by plan Equinor's defined benefit plans are generally based on a minimum of 30 years of service and 66% of the final salary level, including an assumed benefit from the Norwegian National Insurance Scheme.    
Minimum number of years of service for defined benefit plans P30Y    
Defined benefit plan, percentage of final salary level requirement 66.00%    
Maximum age of employees for early retirement premium | yr 62    
Description of early retirement plan premium calculation Equinor is a member of a Norwegian national agreement-based early retirement plan (“AFP”), and the premium is calculated based on the employees' income, but limited to 7.1 times the basic amount in the National Insurance scheme (7.1 G).    
Duration of Equinor's payment portfolio for earned benefits P15Y2M12D    
Current service cost $ 209 $ 184 $ 206
Past service cost 3 0 0
Losses (gains) from curtailment, settlement or plan amendment 0 0 3
Notional contributions 60 55 56
Defined benefit plans 272 238 265
Defined contribution plans 213 192 182
Total net pension cost 488 432 $ 446
Interest cost and changes in fair value of notional assets 238 203  
Interest income from defined benefit plans $ 106 $ 117