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Pensions - Net pension cost (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
yr
Dec. 31, 2019
USD ($)
Dec. 31, 2018
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 30 years    
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).    
Description of discount rate for defined benefit plan the discount rate for the defined benefit plans in Norway was established on the basis of seven years' mortgage covered bonds interest rate extrapolated on a yield curve which matches the duration of Equinor's payment portfolio for earned benefits, which was calculated to be 15.6 years    
Duration of Equinor's payment portfolio for earned benefits 15.6 years    
Current service cost $ 184 $ 206 $ 214
Losses (gains) from curtailment, settlement or plan amendment 0 3 20
Notional contributions 55 56 55
Defined benefit plans 238 265 289
Defined contribution plans 192 182 173
Total net pension cost 432 446 $ 462
Interest cost and changes in fair value of notional assets 203 260  
Interest income from defined benefit plans $ 117 $ 142