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Segments - Segment Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income $ 64,194 $ 79,301 $ 60,999
Revenues inter-segment 0 0 0
Net income/(loss) from equity accounted investments 164 291 188
Total revenues and other income 64,357 79,593 61,187
Purchases (net of inventory variation) (29,532) (38,516) (28,212)
Operating, selling, general and administrative expenses (10,469) (10,286) (9,501)
Depreciation, amortisation and net impairment losses (13,204) (9,249) (8,644)
Exploration expenses (1,854) (1,405) (1,059)
Total Operating expenses (55,058) (59,456) (47,416)
Net operating income/(loss) 9,299 20,137 13,771
Additions to PP&E, intangibles and equity accounted investments 14,782 15,201 10,795
Balance sheet information [abstract]      
Equity accounted investments 1,442 2,863 2,551
Noncurrent Assets 93,285 86,452 83,911
Exploration & Production Norway (E&P) [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 1,048 588 (23)
Revenues inter-segment 17,769 21,877 17,586
Net income/(loss) from equity accounted investments 15 10 129
Total revenues and other income 18,832 22,475 17,692
Purchases (net of inventory variation) (1) 2 0
Operating, selling, general and administrative expenses (3,284) (3,270) (2,954)
Depreciation, amortisation and net impairment losses (5,439) (4,370) (3,874)
Exploration expenses (478) (431) (379)
Total Operating expenses (9,201) (8,069) (7,207)
Net operating income/(loss) 9,631 14,406 10,485
Additions to PP&E, intangibles and equity accounted investments 7,316 6,947 4,869
Balance sheet information [abstract]      
Equity accounted investments 3 1,102 1,133
Exploration & Production (E&P) International [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 2,127 3,181 1,984
Revenues inter-segment 8,168 9,186 7,249
Net income/(loss) from equity accounted investments 30 31 22
Total revenues and other income 10,325 12,399 9,256
Purchases (net of inventory variation) (34) (26) (7)
Operating, selling, general and administrative expenses (3,352) (3,006) (2,804)
Depreciation, amortisation and net impairment losses (6,361) (4,592) (4,423)
Exploration expenses (1,377) (973) (681)
Total Operating expenses (11,124) (8,597) (7,915)
Net operating income/(loss) (800) 3,802 1,341
Additions to PP&E, intangibles and equity accounted investments 5,855 7,403 5,063
Balance sheet information [abstract]      
Equity accounted investments 321 296 234
Marketing, Midstream and Processing (MMP) [Member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 60,491 75,487 58,935
Revenues inter-segment 439 291 83
Net income/(loss) from equity accounted investments 25 16 53
Total revenues and other income 60,955 75,794 59,071
Purchases (net of inventory variation) (54,454) (69,296) (52,647)
Operating, selling, general and administrative expenses (4,897) (4,377) (3,925)
Depreciation, amortisation and net impairment losses (600) (215) (256)
Exploration expenses 0 0 0
Total Operating expenses (59,951) (73,888) (56,828)
Net operating income/(loss) 1,004 1,906 2,243
Additions to PP&E, intangibles and equity accounted investments 788 331 320
Balance sheet information [abstract]      
Equity accounted investments 90 92 134
Other segment [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 527 45 102
Revenues inter-segment 4 2 1
Net income/(loss) from equity accounted investments 93 234 (16)
Total revenues and other income 624 280 87
Purchases (net of inventory variation) (1) 0 0
Operating, selling, general and administrative expenses 272 (288) (235)
Depreciation, amortisation and net impairment losses (804) (72) (91)
Exploration expenses 0 0 0
Total Operating expenses (533) (360) (326)
Net operating income/(loss) 92 (79) (239)
Additions to PP&E, intangibles and equity accounted investments 823 519 543
Balance sheet information [abstract]      
Equity accounted investments 1,028 1,373 1,050
Eliminations [member]      
Disclosure of operating segments [line items]      
Revenues third party, other revenues and other income 0 0 0
Revenues inter-segment (26,379) (31,355) (24,919)
Net income/(loss) from equity accounted investments 0   0
Total revenues and other income (26,379) (31,355) (24,919)
Purchases (net of inventory variation) 24,958 30,805 24,442
Operating, selling, general and administrative expenses 793 653 418
Depreciation, amortisation and net impairment losses 0 0 0
Exploration expenses 0 0 0
Total Operating expenses 25,750 31,458 24,860
Net operating income/(loss) (629) 103 (59)
Additions to PP&E, intangibles and equity accounted investments 0 0 0
Balance sheet information [abstract]      
Equity accounted investments 0 0 0
Unallocated amounts [member]      
Balance sheet information [abstract]      
Noncurrent Assets 11,152 8,655 9,102
Segments [member]      
Balance sheet information [abstract]      
Noncurrent Assets 80,691 74,934 72,258
Segments [member] | Exploration & Production Norway (E&P) [member]      
Balance sheet information [abstract]      
Noncurrent Assets 33,795 30,762 30,278
Segments [member] | Exploration & Production (E&P) International [member]      
Balance sheet information [abstract]      
Noncurrent Assets 37,558 38,672 36,453
Segments [member] | Marketing, Midstream and Processing (MMP) [Member]      
Balance sheet information [abstract]      
Noncurrent Assets 5,124 5,148 5,137
Segments [member] | Other segment [member]      
Balance sheet information [abstract]      
Noncurrent Assets $ 4,214 353 390
Segments [member] | Eliminations [member]      
Balance sheet information [abstract]      
Noncurrent Assets   $ 0 $ 0