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Segments - Segment Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income $ 7,570   $ 17,057 $ 22,629 $ 33,476  
Revenues inter-segment 0   0 0 0  
Net income/(loss) from equity accounted investments 33 $ 71 39 104 103 $ 164 [1]
Total revenues and other income 7,603 15,130 17,096 22,733 33,578 64,357 [1]
Purchases (net of inventory variation) (2,750) (7,396) (8,606) (10,146) (15,261) (29,532) [1]
Operating, selling, general and administrative expenses (2,411)   (2,502) (5,014) (5,141)  
Depreciation, amortisation and net impairment losses (2,522) (4,438) (2,233) (6,959) (4,421) (13,204) [1]
Exploration expenses (393) (635) (235) (1,028) (503) (1,854) [1]
Total operating expenses (8,075) (15,072) (13,575) (23,147) (25,326) (55,058) [1]
Net operating income/(loss) (472) 58 3,521 (414) 8,252 9,299 [1]
Additions to PP&E, intangibles and equity accounted investments 2,307   3,432 4,922 6,830  
Balance sheet information [abstract]            
Equity accounted investments 1,599 1,565 2,870 1,599 2,870 1,442
Noncurrent Assets 86,711 $ 81,540 95,609 86,711 95,609 $ 93,285
Segments [member]            
Balance sheet information [abstract]            
Noncurrent Assets 74,259   82,960 74,259 82,960  
Segments [member] | E&P Norway [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 10   157 17 160  
Revenues inter-segment 1,649   4,226 5,179 9,205  
Net income/(loss) from equity accounted investments 0   7 0 13  
Total revenues and other income 1,659   4,390 5,196 9,378  
Purchases (net of inventory variation) 0   0 0 1  
Operating, selling, general and administrative expenses (706)   (888) (1,341) (1,624)  
Depreciation, amortisation and net impairment losses (992)   (945) (2,833) (1,964)  
Exploration expenses (65)   (79) (160) (193)  
Total operating expenses (1,762)   (1,913) (4,333) (3,781)  
Net operating income/(loss) (104)   2,478 863 5,597  
Additions to PP&E, intangibles and equity accounted investments 1,118   1,718 2,407 2,941  
Balance sheet information [abstract]            
Equity accounted investments 2   1,041 2 1,041  
Noncurrent Assets 30,547   33,517 30,547 33,517  
Segments [member] | E&P International [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 52     218    
Revenues inter-segment 515     1,680    
Net income/(loss) from equity accounted investments (11)     5    
Total revenues and other income 555     1,903    
Purchases (net of inventory variation) (26)     (68)    
Operating, selling, general and administrative expenses (281)     (779)    
Depreciation, amortisation and net impairment losses (509)     (1,380)    
Exploration expenses (288)     (536)    
Total operating expenses (1,103)     (2,763)    
Net operating income/(loss) (548)     (861)    
Additions to PP&E, intangibles and equity accounted investments 484     1,225    
Balance sheet information [abstract]            
Equity accounted investments 563     563    
Noncurrent Assets 19,715     19,715    
Segments [member] | E&P International [member] | Restated [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income     429   907  
Revenues inter-segment     1,122   2,332  
Net income/(loss) from equity accounted investments     9   18  
Total revenues and other income     1,559   3,258  
Purchases (net of inventory variation)     14   (25)  
Operating, selling, general and administrative expenses     (403)   (1,003)  
Depreciation, amortisation and net impairment losses     (477)   (870)  
Exploration expenses     (142)   (267)  
Total operating expenses     (1,008)   (2,165)  
Net operating income/(loss)     551   1,093  
Additions to PP&E, intangibles and equity accounted investments     991   1,779  
Balance sheet information [abstract]            
Equity accounted investments     306   306  
Noncurrent Assets     20,777   20,777  
Segments [member] | E&P USA [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 67     208    
Revenues inter-segment 408     1,152    
Net income/(loss) from equity accounted investments 0     0    
Total revenues and other income 475     1,360    
Purchases (net of inventory variation) 0     0    
Operating, selling, general and administrative expenses (293)     (664)    
Depreciation, amortisation and net impairment losses (475)     (1,711)    
Exploration expenses (40)     (332)    
Total operating expenses (808)     (2,707)    
Net operating income/(loss) (332)     (1,347)    
Additions to PP&E, intangibles and equity accounted investments 268     694    
Balance sheet information [abstract]            
Equity accounted investments 0     0    
Noncurrent Assets 15,557     15,557    
Segments [member] | E&P USA [member] | Restated [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income     98   214  
Revenues inter-segment     972   1,966  
Net income/(loss) from equity accounted investments     2   3  
Total revenues and other income     1,071   2,183  
Purchases (net of inventory variation)     0   0  
Operating, selling, general and administrative expenses     (403)   (801)  
Depreciation, amortisation and net impairment losses     (521)   (1,029)  
Exploration expenses     (14)   (43)  
Total operating expenses     (937)   (1,874)  
Net operating income/(loss)     134   309  
Additions to PP&E, intangibles and equity accounted investments     645   1,078  
Balance sheet information [abstract]            
Equity accounted investments     82   82  
Noncurrent Assets     18,855   18,855  
Segments [member] | MMP [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 7,392   16,315 22,087 32,050  
Revenues inter-segment 88   127 184 227  
Net income/(loss) from equity accounted investments 7   11 18 16  
Total revenues and other income 7,486   16,454 22,289 32,293  
Purchases (net of inventory variation) (5,127)   (15,065) (18,627) (28,532)  
Operating, selling, general and administrative expenses (1,423)   (1,073) (2,767) (2,168)  
Depreciation, amortisation and net impairment losses (326)   (100) (607) (193)  
Exploration expenses 0   0 0 0  
Total operating expenses (6,877)   (16,238) (22,001) (30,892)  
Net operating income/(loss) 610   216 288 1,401  
Additions to PP&E, intangibles and equity accounted investments 51   60 107 547  
Balance sheet information [abstract]            
Equity accounted investments 90   94 90 94  
Noncurrent Assets 4,350   5,362 4,350 5,362  
Segments [member] | Other [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 50   59 99 145  
Revenues inter-segment 1   1 1 2  
Net income/(loss) from equity accounted investments 38   10 82 53  
Total revenues and other income 88   70 182 199  
Purchases (net of inventory variation) 0   0 0 0  
Operating, selling, general and administrative expenses 125   63 184 62  
Depreciation, amortisation and net impairment losses (220)   (190) (429) (364)  
Exploration expenses 0   0 0 0  
Total operating expenses (94)   (127) (245) (302)  
Net operating income/(loss) (6)   (57) (63) (103)  
Additions to PP&E, intangibles and equity accounted investments 386   19 489 485  
Balance sheet information [abstract]            
Equity accounted investments 944   1,347 944 1,347  
Noncurrent Assets 4,090   4,449 4,090 4,449  
Unallocated amounts [member]            
Balance sheet information [abstract]            
Noncurrent Assets 10,853   9,778 10,853 9,778  
Eliminations [member]            
Disclosure of operating segments [line items]            
Revenues third party, other revenue and other income 0   0 0 0  
Revenues inter-segment (2,661)   (6,448) (8,197) (13,732)  
Net income/(loss) from equity accounted investments 0   0 0 0  
Total revenues and other income (2,661)   (6,448) (8,197) (13,732)  
Purchases (net of inventory variation) 2,403   6,445 8,549 13,295  
Operating, selling, general and administrative expenses 166   202 353 393  
Depreciation, amortisation and net impairment losses 0   0 0 0  
Exploration expenses 0   0 0 0  
Total operating expenses 2,569   6,647 8,902 13,688  
Net operating income/(loss) (92)   199 705 (44)  
Additions to PP&E, intangibles and equity accounted investments 0   0 0 0  
Balance sheet information [abstract]            
Equity accounted investments 0   0 0 0  
Noncurrent Assets $ 0   $ 0 $ 0 $ 0  
[1]
Audited