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Segments - Segment Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income $ 90,665 $ 45,765 $ 64,194
Revenues inter-segment 0 0 0
Net income/(loss) from equity accounted investments 259 53 164
Total revenues and other income 90,924 45,818 64,357
Purchases (net of inventory variation) (35,160) (20,986) (29,532)
Operating, selling, general and administrative expenses (9,378) (9,537) (10,469)
Depreciation, amortisation and net impairment losses (11,719) (15,235) (13,204)
Exploration expenses (1,004) (3,483) (1,854)
Total Operating expenses (57,261) (49,241) (55,058)
Net operating income/(loss) 33,663 (3,423) 9,299
Additions to PP&E, intangibles and equity accounted investments 8,506 9,762 14,782
Balance sheet information [abstract]      
Equity accounted investments 2,686 2,262 1,442
Noncurrent Assets 84,618 92,623 95,083
Unallocated amounts [member]      
Balance sheet information [abstract]      
Noncurrent Assets 13,406 13,704 11,152
Segments [member]      
Balance sheet information [abstract]      
Noncurrent Assets 68,527 76,657 82,489
Segments [member] | E&P- Norway [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 269 91 1,048
Revenues inter-segment 38,972 11,804 17,769
Net income/(loss) from equity accounted investments 0 0 15
Total revenues and other income 39,241 11,895 18,832
Purchases (net of inventory variation) 0 0 (1)
Operating, selling, general and administrative expenses (3,729) (2,829) (3,284)
Depreciation, amortisation and net impairment losses (4,678) (5,546) (5,439)
Exploration expenses (363) (423) (478)
Total Operating expenses (8,770) (8,798) (9,201)
Net operating income/(loss) 30,471 3,097 9,631
Additions to PP&E, intangibles and equity accounted investments 5,101 4,851 7,316
Balance sheet information [abstract]      
Equity accounted investments 3 3 3
Noncurrent Assets 35,301 37,733 34,938
Segments [member] | E&P International [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 1,113 451 1,685
Revenues inter-segment 4,230 3,183 4,376
Net income/(loss) from equity accounted investments 214 (146) 24
Total revenues and other income 5,558 3,489 6,085
Purchases (net of inventory variation) (58) (72) (34)
Operating, selling, general and administrative expenses (1,466) (1,439) (1,684)
Depreciation, amortisation and net impairment losses (3,257) (3,471) (2,228)
Exploration expenses (451) (2,071) (668)
Total Operating expenses (5,232) (7,054) (4,614)
Net operating income/(loss) 326 (3,565) 1,471
Additions to PP&E, intangibles and equity accounted investments 1,828 2,609 2,851
Balance sheet information [abstract]      
Equity accounted investments 1,417 1,125 321
Noncurrent Assets 15,358 17,835 21,161
Segments [member] | E&P USA [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 377 368 441
Revenues inter-segment 3,771 2,247 3,792
Net income/(loss) from equity accounted investments 0 0 6
Total revenues and other income 4,149 2,615 4,239
Purchases (net of inventory variation) 0 0 0
Operating, selling, general and administrative expenses (1,076) (1,313) (1,668)
Depreciation, amortisation and net impairment losses (1,733) (3,824) (4,133)
Exploration expenses (190) (990) (709)
Total Operating expenses (2,999) (6,127) (6,510)
Net operating income/(loss) 1,150 (3,512) (2,271)
Additions to PP&E, intangibles and equity accounted investments 690 1,068 3,004
Balance sheet information [abstract]      
Equity accounted investments 0 0 0
Noncurrent Assets 11,406 12,586 16,929
Segments [member] | MMP [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 87,025 44,605 60,491
Revenues inter-segment 321 309 439
Net income/(loss) from equity accounted investments 22 31 25
Total revenues and other income 87,368 44,945 60,955
Purchases (net of inventory variation) (80,873) (38,072) (54,454)
Operating, selling, general and administrative expenses (4,276) (5,060) (4,897)
Depreciation, amortisation and net impairment losses (1,079) (1,453) (600)
Exploration expenses 0 0 0
Total Operating expenses (86,227) (44,586) (59,951)
Net operating income/(loss) 1,141 359 1,004
Additions to PP&E, intangibles and equity accounted investments 221 190 788
Balance sheet information [abstract]      
Equity accounted investments 113 92 90
Noncurrent Assets 3,019 4,368 5,248
Segments [member] | REN [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 1,394 18 258
Revenues inter-segment 0 0 0
Net income/(loss) from equity accounted investments 16 163 95
Total revenues and other income 1,411 181 353
Purchases (net of inventory variation) 0 0 0
Operating, selling, general and administrative expenses (163) (215) (192)
Depreciation, amortisation and net impairment losses (3) (1) (1)
Exploration expenses 0 0 0
Total Operating expenses (166) (216) (193)
Net operating income/(loss) 1,245 (35) 160
Additions to PP&E, intangibles and equity accounted investments 455 31 175
Balance sheet information [abstract]      
Equity accounted investments 1,108 1,017 1,003
Noncurrent Assets 154 3 187
Segments [member] | Other [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 485 232 269
Revenues inter-segment 5 4 4
Net income/(loss) from equity accounted investments 7 5 (1)
Total revenues and other income 497 241 271
Purchases (net of inventory variation) (1) (1) (1)
Operating, selling, general and administrative expenses 264 634 465
Depreciation, amortisation and net impairment losses (970) (939) (803)
Exploration expenses 0 (1) 0
Total Operating expenses (707) (304) (339)
Net operating income/(loss) (210) (63) (68)
Additions to PP&E, intangibles and equity accounted investments 212 1,013 648
Balance sheet information [abstract]      
Equity accounted investments 45 25 25
Noncurrent Assets 3,288 4,132 4,026
Eliminations [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 0 0 0
Revenues inter-segment (47,300) (17,547) (26,379)
Net income/(loss) from equity accounted investments 0 0 0
Total revenues and other income (47,300) (17,547) (26,379)
Purchases (net of inventory variation) 45,773 17,157 24,958
Operating, selling, general and administrative expenses 1,066 685 793
Depreciation, amortisation and net impairment losses 0 0 0
Exploration expenses 0 0 0
Total Operating expenses 46,839 17,842 25,750
Net operating income/(loss) (461) 296 (629)
Additions to PP&E, intangibles and equity accounted investments 0 0 0
Balance sheet information [abstract]      
Equity accounted investments 0 0 0
Noncurrent Assets $ 0 $ 0 $ 0