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Segments - Segment Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income $ 17,446 $ 17,559 $ 7,570 $ 35,005 $ 22,629  
Revenues inter-segment 0 0 0 0 0  
Net income/(loss) from equity accounted investments 16 30 33 47 104 $ 53
Total revenues and other income 17,462 17,589 7,603 35,052 22,733 45,818
Purchases (net of inventory variation) (7,399) (7,166) (2,750) (14,565) (10,146) (20,986)
Operating, selling, general and administrative expenses (2,329) (2,160) (2,411) (4,489) (5,014)  
Depreciation, amortisation and net impairment losses (2,111) (2,797) (2,522) (4,908) (6,959) (15,235)
Exploration expenses (326) (247) (393) (572) (1,028) (3,483)
Total operating expenses (12,164) (12,369) (8,075) (24,534) (23,147) (49,241)
Net operating income/(loss) 5,298 5,220 (472) 10,518 (414) (3,423)
Additions to PP&E, intangibles and equity accounted investments 2,243 2,014 2,307 4,257 4,922  
Balance sheet information [abstract]            
Equity accounted investments 2,377 2,374 1,599 2,377 1,599 2,262
Noncurrent Assets 87,882 86,272 86,711 87,882 86,711 $ 89,786
Segments [member]            
Balance sheet information [abstract]            
Noncurrent Assets 72,202   74,259 72,202 74,259  
Segments [member] | E&P Norway [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 42 28 10 70 17  
Revenues inter-segment 6,167 5,755 1,649 11,923 5,179  
Net income/(loss) from equity accounted investments 0 0 0 0 0  
Total revenues and other income 6,210 5,783 1,659 11,992 5,196  
Purchases (net of inventory variation) 0 0 0 0 0  
Operating, selling, general and administrative expenses (828) (794) (706) (1,622) (1,341)  
Depreciation, amortisation and net impairment losses (908) (1,570) (992) (2,478) (2,833)  
Exploration expenses (55) (70) (65) (125) (160)  
Total operating expenses (1,792) (2,433) (1,762) (4,225) (4,333)  
Net operating income/(loss) 4,418 3,350 (104) 7,767 863  
Additions to PP&E, intangibles and equity accounted investments 1,368 1,308 1,118 2,676 2,407  
Balance sheet information [abstract]            
Equity accounted investments 3   2 3 2  
Noncurrent Assets 35,530   30,547 35,530 30,547  
Segments [member] | E&P International [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 287 221 52 508 218  
Revenues inter-segment 1,170 805 515 1,975 1,680  
Net income/(loss) from equity accounted investments 19 23 (11) 42 5  
Total revenues and other income 1,475 1,049 555 2,525 1,903  
Purchases (net of inventory variation) 14 (29) (26) (15) (68)  
Operating, selling, general and administrative expenses (439) (252) (281) (691) (779)  
Depreciation, amortisation and net impairment losses (228) (400) (509) (627) (1,380)  
Exploration expenses (231) (107) (288) (338) (536)  
Total operating expenses (884) (788) (1,103) (1,672) (2,763)  
Net operating income/(loss) 591 261 (548) 853 (860)  
Additions to PP&E, intangibles and equity accounted investments 429 396 484 825 1,225  
Balance sheet information [abstract]            
Equity accounted investments 1,181   563 1,181 563  
Noncurrent Assets 17,481   19,715 17,481 19,715  
Segments [member] | E&P USA [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 101 121 67 222 208  
Revenues inter-segment 867 872 408 1,739 1,152  
Net income/(loss) from equity accounted investments 0 0 0 0 0  
Total revenues and other income 968 993 475 1,961 1,360  
Purchases (net of inventory variation) 0 0 0 0 0  
Operating, selling, general and administrative expenses (287) (335) (293) (622) (664)  
Depreciation, amortisation and net impairment losses (438) (436) (475) (873) (1,711)  
Exploration expenses (39) (70) (40) (109) (332)  
Total operating expenses (764) (841) (808) (1,605) (2,707)  
Net operating income/(loss) 204 152 (332) 356 (1,347)  
Additions to PP&E, intangibles and equity accounted investments 180 157 268 337 694  
Balance sheet information [abstract]            
Equity accounted investments 0   0 0 0  
Noncurrent Assets 11,811   15,557 11,811 15,557  
Segments [member] | MMP [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 16,892 15,697 7,392 32,589 22,087  
Revenues inter-segment 82 84 88 166 184  
Net income/(loss) from equity accounted investments 7 8 7 15 18  
Total revenues and other income 16,981 15,789 7,486 32,770 22,289  
Purchases (net of inventory variation) (15,448) (14,176) (5,127) (29,625) (18,627)  
Operating, selling, general and administrative expenses (1,097) (1,069) (1,423) (2,166) (2,767)  
Depreciation, amortisation and net impairment losses (284) (152) (326) (436) (607)  
Exploration expenses 0 0 0 0 0  
Total operating expenses (16,829) (15,397) (6,877) (32,226) (22,001)  
Net operating income/(loss) 152 392 610 544 288  
Additions to PP&E, intangibles and equity accounted investments 59 38 51 97 107  
Balance sheet information [abstract]            
Equity accounted investments 96   87 96 87  
Noncurrent Assets 3,572   4,350 3,572 4,350  
Segments [member] | REN (member)            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 7 1,382 0 1,389 0  
Revenues inter-segment 0 0 0 0 0  
Net income/(loss) from equity accounted investments (6) (1) 38 (6) 82  
Total revenues and other income 2 1,381 38 1,383 82  
Purchases (net of inventory variation) 0 0 0 0 0  
Operating, selling, general and administrative expenses (32) (40) (38) (72) (71)  
Depreciation, amortisation and net impairment losses (1) 0 0 (1) 0  
Exploration expenses 0 0 0 0 0  
Total operating expenses (33) (40) (38) (73) 72  
Net operating income/(loss) (31) 1,341 0 1,310 11  
Additions to PP&E, intangibles and equity accounted investments 156 128 4 284 5  
Balance sheet information [abstract]            
Equity accounted investments 1,067   925 1,067 925  
Noncurrent Assets 141   189 141 189  
Segments [member] | Other [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 117 111 50 227 99  
Revenues inter-segment 1 1 1 2 1  
Net income/(loss) from equity accounted investments (4) 0 0 (4) 0  
Total revenues and other income 114 111 50 225 100  
Purchases (net of inventory variation) 0 0 0 (1) 0  
Operating, selling, general and administrative expenses 57 54 163 110 255  
Depreciation, amortisation and net impairment losses (252) (240) (220) (492) (429)  
Exploration expenses 0 0 0 0 0  
Total operating expenses (195) (187) (56) (383) (174)  
Net operating income/(loss) (82) (76) (6) (157) (74)  
Additions to PP&E, intangibles and equity accounted investments 52 (13) 382 38 484  
Balance sheet information [abstract]            
Equity accounted investments 32   20 32 20  
Noncurrent Assets 3,668   3,901 3,668 3,901  
Unallocated amounts [member]            
Balance sheet information [abstract]            
Noncurrent Assets 13,303   10,853 13,303 10,853  
Eliminations [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 0 0 0 0 0  
Revenues inter-segment (8,287) (7,517) (2,661) (15,804) (8,197)  
Net income/(loss) from equity accounted investments 0 0 0 0 0  
Total revenues and other income (8,287) (7,517) (2,661) (15,804) (8,197)  
Purchases (net of inventory variation) 8,035 7,040 2,403 15,076 8,549  
Operating, selling, general and administrative expenses 298 277 166 574 353  
Depreciation, amortisation and net impairment losses 0 0 0 0 0  
Exploration expenses 0 0 0 0 0  
Total operating expenses 8,333 7,317 2,569 15,650 8,902  
Net operating income/(loss) 46 (200) (92) (154) 705  
Additions to PP&E, intangibles and equity accounted investments 0 $ 0 0 0 0  
Balance sheet information [abstract]            
Equity accounted investments 0   0 0 0  
Noncurrent Assets $ 0   $ 0 $ 0 0  
Eliminations [member] | E&P Norway [member]            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         2,407  
Eliminations [member] | E&P International [member]            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         1,225  
Eliminations [member] | E&P USA [member]            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         694  
Eliminations [member] | MMP [member]            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         107  
Eliminations [member] | REN (member)            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         5  
Eliminations [member] | Other [member]            
Disclosure of operating segments [line items]            
Additions to PP&E, intangibles and equity accounted investments         $ 484