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Segment Disclosures and Related Information - Sales (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues $ 14,250 $ 21,013 $ 41,412 $ 59,936
Lower 48        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 9,883 14,287 28,321 40,302
Canada        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,320 1,348 3,353 4,662
Intersegment eliminations | Lower 48        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 (2) (5) (15)
Intersegment eliminations | Canada        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues (512) (583) (1,253) (1,960)
Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 14,250 21,013 41,412 59,936
Operating Segments | Alaska        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,801 1,984 5,245 6,251
Operating Segments | Lower 48        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 9,883 14,285 28,316 40,287
Operating Segments | Canada        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 808 765 2,100 2,702
Operating Segments | Europe, Middle East and North Africa        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,211 3,361 4,282 8,602
Operating Segments | Asia Pacific        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 544 617 1,440 2,005
Corporate and Other        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 3 1 29 89
United States        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 11,550 16,269 33,392 46,624
Canada        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 808 764 2,100 2,702
China        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 225 273 671 847
Indonesia        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 159
Libya        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 392 317 1,209 1,099
Malaysia        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 319 345 769 999
Norway        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 589 1,042 1,817 2,711
United Kingdom        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 366 2,002 1,451 4,792
Other foreign countries        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1 1 3 3
Natural gas        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 2,209 8,295 8,481 21,560
Natural gas liquids        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 677 989 1,954 2,909
Crude oil        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 10,027 10,353 27,894 31,717
Other        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues $ 1,337 $ 1,376 $ 3,083 $ 3,750