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Segment Disclosures and Related Information - Summary of Segment Level Net Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues $ 15,031 $ 13,041 $ 45,552 $ 40,509
Production and operating expenses 2,632 2,261 7,710 6,440
Depreciation, depletion and amortization 2,917 2,390 8,501 6,935
Income tax provision (benefit) 1,202 1,176 3,865 3,763
Total 6,751 5,827 20,076 17,138
Equity in earnings of affiliates (345) (441) (1,052) (1,265)
Interest income (62) (107) (205) (307)
Interest and debt expense 223 189 660 592
Other 6,738 5,514 19,527 17,412
Total 6,554 5,155 18,930 16,432
Net income (loss) 1,726 2,059 6,546 6,939
Operating Segments And Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 15,515 13,531 47,087 42,137
Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues (484) (490) (1,535) (1,628)
Alaska        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,443 1,481 4,368 4,934
Production and operating expenses 564 520 1,616 1,489
Depreciation, depletion and amortization 327 309 1,043 954
Income tax provision (benefit) 61 103 247 360
Total 952 932 2,906 2,803
Equity in earnings of affiliates 0 1 0 1
Interest income 0 0 0 0
Interest and debt expense 0 0 0 0
Other 361 281 870 1,157
Total 361 282 870 1,158
Net income (loss) 130 267 592 973
Alaska | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,443 1,481 4,368 4,934
Alaska | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
L48        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 10,538 9,080 32,049 27,441
Production and operating expenses 1,434 1,180 4,399 3,420
Depreciation, depletion and amortization 2,079 1,640 5,986 4,629
Income tax provision (benefit) 345 347 1,175 1,099
Total 3,858 3,167 11,560 9,148
Equity in earnings of affiliates (3) 0 (11) 0
Interest income 0 0 0 0
Interest and debt expense 0 0 0 0
Other 5,443 4,672 16,071 14,412
Total 5,440 4,672 16,060 14,412
Net income (loss) 1,240 1,241 4,429 3,881
L48 | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 10,541 9,080 32,055 27,442
L48 | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues (3) 0 (6) (1)
Canada        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 941 660 2,774 2,537
Production and operating expenses 218 269 635 709
Depreciation, depletion and amortization 142 147 416 471
Income tax provision (benefit) 60 10 191 152
Total 420 426 1,242 1,332
Equity in earnings of affiliates 0 0 0 0
Interest income 0 0 0 0
Interest and debt expense 0 0 0 0
Other 333 209 939 739
Total 333 209 939 739
Net income (loss) 188 25 593 466
Canada | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,414 1,139 4,280 4,136
Canada | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues (473) (479) (1,506) (1,599)
EMENA        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,578 1,337 4,918 4,090
Production and operating expenses 213 154 669 471
Depreciation, depletion and amortization 245 189 662 544
Income tax provision (benefit) 676 678 2,191 2,121
Total 1,134 1,021 3,522 3,136
Equity in earnings of affiliates (157) (154) (445) (431)
Interest income 0 0 0 0
Interest and debt expense 0 0 0 0
Other 274 172 858 532
Total 117 18 413 101
Net income (loss) 327 298 983 853
EMENA | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 1,578 1,337 4,918 4,090
EMENA | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
AP        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 515 478 1,410 1,495
Production and operating expenses 101 110 251 281
Depreciation, depletion and amortization 113 97 350 314
Income tax provision (benefit) 89 73 220 173
Total 303 280 821 768
Equity in earnings of affiliates (194) (290) (585) (840)
Interest income (2) (2) (6) (6)
Interest and debt expense 0 0 0 0
Other 99 35 230 162
Total (97) (257) (361) (684)
Net income (loss) 309 455 950 1,411
AP | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 515 478 1,410 1,495
AP | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
OI        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
Production and operating expenses 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Income tax provision (benefit) 0 0 0 0
Total 0 0 0 0
Equity in earnings of affiliates 0 0 0 0
Interest income 0 0 0 0
Interest and debt expense 0 0 0 0
Other (4) (1) (7) (3)
Total (4) (1) (7) (3)
Net income (loss) 4 1 7 3
OI | Operating Segments        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
OI | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 0 0 0 0
Corporate        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 16 5 33 12
Production and operating expenses 102 28 140 70
Depreciation, depletion and amortization 11 8 44 23
Income tax provision (benefit) (29) (35) (159) (142)
Total 84 1 25 (49)
Equity in earnings of affiliates 9 2 (11) 5
Interest income (60) (105) (199) (301)
Interest and debt expense 223 189 660 592
Other 232 146 566 413
Total 404 232 1,016 709
Net income (loss) (472) (228) (1,008) (648)
Corporate | Corporate        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues 24 16 56 40
Corporate | Intersegment eliminations        
Segment Reporting Information [Line Items]        
Consolidated sales and other operating revenues $ (8) $ (11) $ (23) $ (28)