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Segments - Segment Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income $ 45,765 $ 64,194 $ 79,301
Revenues inter-segment 0 0 0
Net income/(loss) from equity accounted investments 53 164 291
Total revenues and other income 45,818 64,357 79,593
Purchases (net of inventory variation) (20,986) (29,532) (38,516)
Operating, selling, general and administrative expenses (9,537) (10,469) (10,286)
Depreciation, amortisation and net impairment losses (15,235) (13,204) (9,249)
Exploration expenses (3,483) (1,854) (1,405)
Total Operating expenses (49,241) (55,058) (59,456)
Net operating income/(loss) (3,423) 9,299 20,137
Additions to PP&E, intangibles and equity accounted investments 9,761 14,782  
Balance sheet information [abstract]      
Equity accounted investments 2,262 1,442  
Noncurrent Assets 89,786 93,285  
Unallocated amounts [member]      
Balance sheet information [abstract]      
Noncurrent Assets 13,704 11,152  
Segments [member]      
Balance sheet information [abstract]      
Noncurrent Assets 73,820 80,691  
Segments [member] | E&P- Norway [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 91 1,048 588
Revenues inter-segment 11,804 17,769 21,877
Net income/(loss) from equity accounted investments 0 15 10
Total revenues and other income 11,895 18,832 22,475
Purchases (net of inventory variation) 0 (1) 2
Operating, selling, general and administrative expenses (2,829) (3,284) (3,270)
Depreciation, amortisation and net impairment losses (5,546) (5,439) (4,370)
Exploration expenses (423) (478) (431)
Total Operating expenses (8,798) (9,201) (8,069)
Net operating income/(loss) 3,097 9,631 14,406
Additions to PP&E, intangibles and equity accounted investments 4,851 7,316  
Balance sheet information [abstract]      
Equity accounted investments 3 3  
Noncurrent Assets 35,833 33,795  
Segments [member] | E&P International [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 452    
Revenues inter-segment 3,183    
Net income/(loss) from equity accounted investments (146)    
Total revenues and other income 3,489    
Purchases (net of inventory variation) (72)    
Operating, selling, general and administrative expenses (1,440)    
Depreciation, amortisation and net impairment losses (3,471)    
Exploration expenses (2,071)    
Total Operating expenses (7,054)    
Net operating income/(loss) (3,565)    
Additions to PP&E, intangibles and equity accounted investments 2,608    
Balance sheet information [abstract]      
Equity accounted investments 1,125    
Noncurrent Assets 17,329    
Segments [member] | E&P International [member] | Restated [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income   1,685 2,758
Revenues inter-segment   4,376 5,195
Net income/(loss) from equity accounted investments   24 23
Total revenues and other income   6,085 7,978
Purchases (net of inventory variation)   (34) (23)
Operating, selling, general and administrative expenses   (1,684) (1,569)
Depreciation, amortisation and net impairment losses   (2,228) (2,394)
Exploration expenses   (668) (586)
Total Operating expenses   (4,614) (4,575)
Net operating income/(loss)   1,471 3,402
Additions to PP&E, intangibles and equity accounted investments   2,851  
Balance sheet information [abstract]      
Equity accounted investments   321  
Noncurrent Assets   20,784  
Segments [member] | E&P USA [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 368    
Revenues inter-segment 2,247    
Net income/(loss) from equity accounted investments 0    
Total revenues and other income 2,615    
Purchases (net of inventory variation) 0    
Operating, selling, general and administrative expenses (1,313)    
Depreciation, amortisation and net impairment losses (3,824)    
Exploration expenses (990)    
Total Operating expenses (6,127)    
Net operating income/(loss) (3,512)    
Additions to PP&E, intangibles and equity accounted investments 1,068    
Balance sheet information [abstract]      
Equity accounted investments 0    
Noncurrent Assets 12,376    
Segments [member] | E&P USA [member] | Restated [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income   441 423
Revenues inter-segment   3,792 3,991
Net income/(loss) from equity accounted investments   6 8
Total revenues and other income   4,239 4,421
Purchases (net of inventory variation)   0 (3)
Operating, selling, general and administrative expenses   (1,668) (1,437)
Depreciation, amortisation and net impairment losses   (4,133) (2,198)
Exploration expenses   (709) (387)
Total Operating expenses   (6,510) (4,022)
Net operating income/(loss)   (2,271) 400
Additions to PP&E, intangibles and equity accounted investments   3,004  
Balance sheet information [abstract]      
Equity accounted investments   0  
Noncurrent Assets   16,774  
Segments [member] | MMP [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 44,605 60,491 75,487
Revenues inter-segment 309 439 291
Net income/(loss) from equity accounted investments 31 25 16
Total revenues and other income 44,945 60,955 75,794
Purchases (net of inventory variation) (38,072) (54,454) (69,296)
Operating, selling, general and administrative expenses (5,060) (4,897) (4,377)
Depreciation, amortisation and net impairment losses (1,453) (600) (215)
Exploration expenses 0 0 0
Total Operating expenses (44,586) (59,951) (73,888)
Net operating income/(loss) 359 1,004 1,906
Additions to PP&E, intangibles and equity accounted investments 190 788  
Balance sheet information [abstract]      
Equity accounted investments 92 90  
Noncurrent Assets 4,147 5,124  
Segments [member] | Other [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 249 527 45
Revenues inter-segment 4 4 2
Net income/(loss) from equity accounted investments 168 93 234
Total revenues and other income 421 624 280
Purchases (net of inventory variation) 1 (1) 0
Operating, selling, general and administrative expenses 419 272 (288)
Depreciation, amortisation and net impairment losses (940) (804) (72)
Exploration expenses 1 0 0
Total Operating expenses (519) (533) (360)
Net operating income/(loss) (98) 92 (79)
Additions to PP&E, intangibles and equity accounted investments 1,044 823  
Balance sheet information [abstract]      
Equity accounted investments 1,042 1,028  
Noncurrent Assets 4,135 4,214  
Segments [member] | New Energy Solutions [member]      
Disclosure of operating segments [line items]      
Net income/(loss) from equity accounted investments 163 95 234
Eliminations [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 0 0 0
Revenues inter-segment (17,547) (26,379) (31,355)
Net income/(loss) from equity accounted investments 0 0 0
Total revenues and other income (17,547) (26,379) (31,355)
Purchases (net of inventory variation) 17,157 24,958 30,805
Operating, selling, general and administrative expenses 685 793 653
Depreciation, amortisation and net impairment losses 0 0 0
Exploration expenses 0 0 0
Total Operating expenses 17,842 25,750 31,458
Net operating income/(loss) 296 (629) $ 103
Additions to PP&E, intangibles and equity accounted investments 0 $ 0  
Balance sheet information [abstract]      
Equity accounted investments 0    
Noncurrent Assets $ 0