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Condensed consolidated financial information related to guaranteed debt securities - Cash flow (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed statement of cash flows [abstract] |  |  |
Cash flows provided by (used in) operating activities | $ 13,749 | $ 19,694 | $ 14,802
Cash flows provided by (used in) investing activities | (10,594) | (11,212) | (10,117)
Cash flows provided by (used in) financing activities | (5,497) | (5,024) | (5,822)
Net increase (decrease) in cash and cash equivalents | (2,341) | 3,458 | (1,137)
Effect of exchange rate changes on cash and cash equivalents (net of overdraft) | (38) | (292) | 436
Cash and cash equivalents at the beginning of the period (net of overdraft) | 7,556 | 4,390 | 5,090
Cash and cash equivalents at the end of the period (net of overdraft) | 5,177 | 7,556 | 4,390
Equinor ASA [member] |  |  |
Condensed statement of cash flows [abstract] |  |  |
Cash flows provided by (used in) operating activities | 1,728 | 4,565 | 339
Cash flows provided by (used in) investing activities | 734 | 1,046 | 3,227
Cash flows provided by (used in) financing activities | (5,465) | (2,840) | (4,459)
Net increase (decrease) in cash and cash equivalents | (3,002) | 2,771 | (892)
Effect of exchange rate changes on cash and cash equivalents (net of overdraft) | (13) | (243) | 377
Cash and cash equivalents at the beginning of the period (net of overdraft) | 6,287 | 3,759 | 4,274
Cash and cash equivalents at the end of the period (net of overdraft) | 3,272 | 6,287 | 3,759
Equinor Energy AS [member] |  |  |
Condensed statement of cash flows [abstract] |  |  |
Cash flows provided by (used in) operating activities | 8,433 | 12,421 | 9,506
Cash flows provided by (used in) investing activities | (8,258) | (8,281) | (9,070)
Cash flows provided by (used in) financing activities | (186) | (4,140) | (478)
Net increase (decrease) in cash and cash equivalents | (11) | 0 | (42)
Effect of exchange rate changes on cash and cash equivalents (net of overdraft) | (1) | 0 | 23
Cash and cash equivalents at the beginning of the period (net of overdraft) | 27 | 27 | 46
Cash and cash equivalents at the end of the period (net of overdraft) | 15 | 27 | 27
Non-guarantor subsidiaries [Member] |  |  |
Condensed statement of cash flows [abstract] |  |  |
Cash flows provided by (used in) operating activities | 6,389 | 7,224 | 5,242
Cash flows provided by (used in) investing activities | (5,418) | (6,649) | (4,718)
Cash flows provided by (used in) financing activities | (300) | 112 | (727)
Net increase (decrease) in cash and cash equivalents | 672 | 687 | (203)
Effect of exchange rate changes on cash and cash equivalents (net of overdraft) | (24) | (49) | 36
Cash and cash equivalents at the beginning of the period (net of overdraft) | 1,242 | 603 | 770
Cash and cash equivalents at the end of the period (net of overdraft) | 1,890 | 1,242 | 603
Consodolidation Adjustments [Member] |  |  |
Condensed statement of cash flows [abstract] |  |  |
Cash flows provided by (used in) operating activities | (2,802) | (4,516) | (286)
Cash flows provided by (used in) investing activities | 2,347 | 2,672 | 444
Cash flows provided by (used in) financing activities | 455 | 1,844 | (158)
Net increase (decrease) in cash and cash equivalents | 0 | 0 | 0
Effect of exchange rate changes on cash and cash equivalents (net of overdraft) | 0 | 0 | 0
Cash and cash equivalents at the beginning of the period (net of overdraft) | 0 | 0 | 0
Cash and cash equivalents at the end of the period (net of overdraft) | $ 0 | $ 0 | $ 0

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- Definition The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_50_d&doctype=Standard -URIDate 2019-03-27 + Details
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