v3.25.4
Operating Segments and Geographic Data - Segment Sales and Operating Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues $ 184,432 $ 193,414 $ 196,913
Income (loss) from equity affiliates 3,000 4,596 5,131
Other income (loss) 1,599 4,782 (1,095)
Total Revenues and Other Income 189,031 202,792 200,949
Purchased crude oil and products 108,214 119,206 119,196
Operating and SG&A expenses 33,444 32,493 29,240
Depreciation, depletion and amortization 20,132 17,282 17,326
Other costs and deduction 7,498 6,305 5,603
Total Costs and Other Deductions 169,288 175,286 171,365
Income Tax Expense (Benefit) 7,258 9,757 8,173
Less: Net income (loss) attributable to noncontrolling interests 186 88 42
Net income (loss) attributable to CUSA 12,299 17,661 21,369
Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 184,328 193,282 196,780
All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 104 132 133
Income (loss) from equity affiliates (9) (4) (9)
Other income (loss) 549 522 182
Total Revenues and Other Income 644 650 306
Purchased crude oil and products 0 0 0
Operating and SG&A expenses 2,908 2,914 2,034
Depreciation, depletion and amortization 283 334 319
Other costs and deduction 1,358 723 620
Total Costs and Other Deductions 4,549 3,971 2,973
Income Tax Expense (Benefit) (505) (470) (329)
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to CUSA (3,545) (2,668) (2,206)
Interest income 257 296 491
Interest expense 1,096 539 432
U.S.      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 11,067 8,981 8,910
U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 19,608 14,640 13,808
U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 65,331 70,672 74,774
Int'l.      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 9,065 8,301 8,416
Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 33,844 32,208 31,934
Total Revenues and Other Income   39,310  
Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 65,545 75,762 76,264
Operating Segments      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 231,370 246,232 246,142
Operating Segments | Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 230,789 245,615 245,545
Income (loss) from equity affiliates 3,009 4,600 5,140
Other income (loss) 1,050 4,260 (1,277)
Total Revenues and Other Income 188,387 202,142 200,643
Purchased crude oil and products 108,214 119,206 119,196
Operating and SG&A expenses 30,536 29,579 27,206
Depreciation, depletion and amortization 19,849 16,948 17,007
Other costs and deduction 6,140 5,582 4,983
Total Costs and Other Deductions 164,739 171,315 168,392
Income Tax Expense (Benefit) 7,763 10,227 8,502
Less: Net income (loss) attributable to noncontrolling interests 186 88 42
Net income (loss) attributable to CUSA 15,844 20,329 23,575
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 18,445 15,497 15,775
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 1,404 1,451 1,232
Operating Segments | All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 581 617 597
Operating Segments | U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 45,518 44,302 40,115
Income (loss) from equity affiliates (36) (62) (387)
Other income (loss) 433 346 (2,536)
Total Revenues and Other Income 20,005 14,924 10,885
Purchased crude oil and products 14,505 13,326 13,019
Operating and SG&A expenses 10,180 7,708 6,879
Depreciation, depletion and amortization 9,694 7,562 7,666
Other costs and deduction 1,663 1,805 1,676
Total Costs and Other Deductions 36,042 30,401 29,240
Income Tax Expense (Benefit) 1,750 2,198 1,141
Less: Net income (loss) attributable to noncontrolling interests 115 28 21
Net income (loss) attributable to CUSA 5,815 7,602 4,148
Operating Segments | U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 72,485 80,417 83,567
Income (loss) from equity affiliates 448 1,010 736
Other income (loss) 134 358 444
Total Revenues and Other Income 65,913 72,040 75,954
Purchased crude oil and products 28,267 33,514 37,176
Operating and SG&A expenses 8,849 9,425 8,432
Depreciation, depletion and amortization 1,100 1,091 931
Other costs and deduction 649 550 515
Total Costs and Other Deductions 38,865 44,580 47,054
Income Tax Expense (Benefit) 185 84 1,109
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to CUSA 1,375 531 3,904
Operating Segments | Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 42,861 43,466 43,805
Income (loss) from equity affiliates 2,235 3,642 4,272
Other income (loss) 466 3,460 776
Total Revenues and Other Income 36,545   36,982
Purchased crude oil and products 11,223 9,445 7,270
Operating and SG&A expenses 5,657 6,412 5,837
Depreciation, depletion and amortization 8,751 7,935 8,109
Other costs and deduction 1,420 1,156 1,010
Total Costs and Other Deductions 27,051 24,948 22,226
Income Tax Expense (Benefit) 5,290 7,548 5,733
Less: Net income (loss) attributable to noncontrolling interests 9 4 7
Net income (loss) attributable to CUSA 7,007 11,000 13,290
Operating Segments | Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 69,925 77,430 78,058
Income (loss) from equity affiliates 362 10 519
Other income (loss) 17 96 39
Total Revenues and Other Income 65,924 75,868 76,822
Purchased crude oil and products 54,219 62,921 61,731
Operating and SG&A expenses 5,850 6,034 6,058
Depreciation, depletion and amortization 304 360 301
Other costs and deduction 2,408 2,071 1,782
Total Costs and Other Deductions 62,781 71,386 69,872
Income Tax Expense (Benefit) 538 397 519
Less: Net income (loss) attributable to noncontrolling interests 62 56 14
Net income (loss) attributable to CUSA 1,647 1,196 2,233
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (46,938) (52,818) (49,229)
Total Revenues and Other Income 0 0 0
Intersegment Eliminations | Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (46,461) (52,333) (48,765)
Total Revenues and Other Income 145 (183) (132)
Intersegment Eliminations | All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (477) (485) (464)
Total Revenues and Other Income (145) 183 132
Intersegment Eliminations | U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (25,910) (29,662) (26,307)
Total Revenues and Other Income 23,717 25,305 23,665
Intersegment Eliminations | U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (7,154) (9,745) (8,793)
Total Revenues and Other Income (25,488) (26,845) (23,887)
Intersegment Eliminations | Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (9,017) (11,258) (11,871)
Total Revenues and Other Income 2,812 4,190 4,274
Intersegment Eliminations | Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (4,380) (1,668) (1,794)
Total Revenues and Other Income $ (896) $ (2,833) $ (4,184)