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Financial instruments - Sensitivity analysis of market risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Gains (losses) derivative financial instruments | $ 473 | $ (341) | $ (61)
Commodity price sensitivity [member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | (30.00%) | (30.00%) |
Commodity price sensitivity [member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | 30.00% | 30.00% |
Commodity price sensitivity [member] | Crude oil and refined products [member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Gains (losses) derivative financial instruments | $ 569 | $ 275 |
Commodity price sensitivity [member] | Crude oil and refined products [member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Gains (losses) derivative financial instruments | (563) | (230) |
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Gains (losses) derivative financial instruments | (33) | 1,157 |
Commodity price sensitivity [member] | Natural gas and electricity [Member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Gains (losses) derivative financial instruments | $ 49 | $ (1,156) |
Equity price risk [member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | (35.00%) |  |
Net gains (losses) | $ (631) |  |
Equity price risk [member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | 35.00% |  |
Net gains (losses) | $ 631 |  |
Currency risk sensitivity [member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | (9.00%) | (9.00%) |
Currency risk sensitivity [member] | Minimum (%) [member] | United States Dollar (USD) [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Foreign exchange gain (loss) | $ (220) | $ (230) |
Currency risk sensitivity [member] | Minimum (%) [member] | Norwegian kroner (NOK) [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Foreign exchange gain (loss) | $ 282 | $ 311 |
Currency risk sensitivity [member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | 9.00% | 9.00% |
Currency risk sensitivity [member] | Maximum (%) [member] | United States Dollar (USD) [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Foreign exchange gain (loss) | $ 220 | $ 230 |
Currency risk sensitivity [member] | Maximum (%) [member] | Norwegian kroner (NOK) [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Foreign exchange gain (loss) | $ (282) | $ (311) |
Interest rate sensitivity [member] | Minimum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | (0.60%) | (0.60%) |
Net gains (losses) | $ 526 | $ 575 |
Interest rate sensitivity [member] | Maximum (%) [member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Percentage of reasonably possible change, market risk | 0.60% | 0.60% |
Net gains (losses) | $ (526) | $ (575) |

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