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Financial instruments - Sensitivity analysis of market risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Gains (losses) derivative financial instruments | $ (708) | $ 448 | $ 473
Commodity price sensitivity [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | 30.00% |  |
Commodity price sensitivity [member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | (0.30%) | (0.30%) |
Commodity price sensitivity [member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | 0.30% | 0.30% |
Commodity price sensitivity [member] | Crude oil and refined products [member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Gains (losses) derivative financial instruments | $ 735 | $ 1,025 |
Commodity price sensitivity [member] | Crude oil and refined products [member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Gains (losses) derivative financial instruments | (735) | (1,025) |
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Gains (losses) derivative financial instruments | 227 | 184 |
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Gains (losses) derivative financial instruments | $ (141) | $ (94) |
Equity price risk [member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | (35.00%) | (35.00%) |
Net gains (losses) | $ (534) | $ (684) |
Equity price risk [member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | 35.00% | 35.00% |
Net gains (losses) | $ 534 | $ 684 |
Currency risk sensitivity [member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | (10.00%) | (8.00%) |
Currency risk sensitivity [member] | Minimum (%) [member] | United States Dollar (USD) [Member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Foreign exchange gain (loss) | $ (1,789) | $ (319) |
Currency risk sensitivity [member] | Minimum (%) [member] | Norwegian kroner (NOK) [Member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Foreign exchange gain (loss) | $ 2,144 | $ 322 |
Currency risk sensitivity [member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | 10.00% | 8.00% |
Currency risk sensitivity [member] | Maximum (%) [member] | United States Dollar (USD) [Member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Foreign exchange gain (loss) | $ 1,789 | $ 319 |
Currency risk sensitivity [member] | Maximum (%) [member] | Norwegian kroner (NOK) [Member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Foreign exchange gain (loss) | $ (2,144) | $ (322) |
Interest rate sensitivity [member] | Minimum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | 0.80% | 0.60% |
Net gains (losses) | $ 448 | $ 516 |
Interest rate sensitivity [member] | Maximum (%) [member] |  |  |
Price Assumptions Used For Impairment Calculations [Line Items] |  |  |
Percentage of reasonably possible change, market risk | (0.80%) | (0.60%) |
Net gains (losses) | $ (448) | $ (516) |

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