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Operating Segments and Geographic Data - Segment Sales and Operating Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues $ 193,414 $ 196,913 $ 235,717
Income (loss) from equity affiliates 4,596 5,131 8,585
Other income (loss) 4,782 (1,095) 1,950
Total Revenues and Other Income 202,792 200,949 246,252
Purchased crude oil and products 119,206 119,196 145,416
Operating and SG&A expenses 32,493 29,240 29,321
Depreciation, depletion and amortization 17,282 17,326 16,319
Other costs and deduction 6,305 5,603 5,522
Total Costs and Other Deductions 175,286 171,365 196,578
Income Tax Expense (Benefit) 9,757 8,173 14,066
Less: Net income (loss) attributable to noncontrolling interests 88 42 143
Net income (loss) attributable to CUSA 17,661 21,369 35,465
Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 193,282 196,780 235,601
All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 132 133 116
Income (loss) from equity affiliates (4) (9) (6)
Other income (loss) 522 182 56
Total Revenues and Other Income 650 306 166
Purchased crude oil and products 0 0 0
Operating and SG&A expenses 2,914 2,034 2,789
Depreciation, depletion and amortization 334 319 253
Other costs and deduction 723 620 632
Total Costs and Other Deductions 3,971 2,973 3,674
Income Tax Expense (Benefit) (470) (329) (462)
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to CUSA (2,668) (2,206) (2,974)
Interest income 296 491 261
Interest expense 539 432 476
U.S.      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 8,981 8,910 6,172
U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 14,640 13,808 20,952
U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 70,672 74,774 86,295
Int'l.      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 8,301 8,416 10,147
Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 32,208 31,934 42,341
Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 75,762 76,264 86,013
Operating Segments      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 246,232 246,142 287,061
Operating Segments | Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 245,615 245,545 286,543
Income (loss) from equity affiliates 4,600 5,140 8,591
Other income (loss) 4,260 (1,277) 1,894
Total Revenues and Other Income 202,142 200,643 246,086
Purchased crude oil and products 119,206 119,196 145,416
Operating and SG&A expenses 29,579 27,206 26,532
Depreciation, depletion and amortization 16,948 17,007 16,066
Other costs and deduction 5,582 4,983 4,890
Total Costs and Other Deductions 171,315 168,392 192,904
Income Tax Expense (Benefit) 10,227 8,502 14,528
Less: Net income (loss) attributable to noncontrolling interests 88 42 143
Net income (loss) attributable to CUSA 20,329 23,575 38,439
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 15,497 15,775 14,842
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Depreciation, depletion and amortization 1,451 1,232 1,224
Operating Segments | All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 617 597 518
Operating Segments | U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 44,302 40,115 50,822
Income (loss) from equity affiliates (62) (387) (22)
Other income (loss) 346 (2,536) 103
Total Revenues and Other Income 14,924 10,885 21,033
Purchased crude oil and products 13,326 13,019 21,008
Operating and SG&A expenses 7,708 6,879 6,799
Depreciation, depletion and amortization 7,562 7,666 5,012
Other costs and deduction 1,805 1,676 1,699
Total Costs and Other Deductions 30,401 29,240 34,518
Income Tax Expense (Benefit) 2,198 1,141 3,678
Less: Net income (loss) attributable to noncontrolling interests 28 21 17
Net income (loss) attributable to CUSA 7,602 4,148 12,621
Operating Segments | U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 80,417 83,567 91,824
Income (loss) from equity affiliates 1,010 736 1,003
Other income (loss) 358 444 527
Total Revenues and Other Income 72,040 75,954 87,825
Purchased crude oil and products 33,514 37,176 40,483
Operating and SG&A expenses 9,425 8,432 7,829
Depreciation, depletion and amortization 1,091 931 913
Other costs and deduction 550 515 446
Total Costs and Other Deductions 44,580 47,054 49,671
Income Tax Expense (Benefit) 84 1,109 1,515
Less: Net income (loss) attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to CUSA 531 3,904 5,394
Operating Segments | Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 43,466 43,805 56,156
Income (loss) from equity affiliates 3,642 4,272 6,648
Other income (loss) 3,460 776 1,272
Total Revenues and Other Income 39,310 36,982 50,261
Purchased crude oil and products 9,445 7,270 12,717
Operating and SG&A expenses 6,412 5,837 6,810
Depreciation, depletion and amortization 7,935 8,109 9,830
Other costs and deduction 1,156 1,010 1,230
Total Costs and Other Deductions 24,948 22,226 30,587
Income Tax Expense (Benefit) 7,548 5,733 9,055
Less: Net income (loss) attributable to noncontrolling interests 4 7 34
Net income (loss) attributable to CUSA 11,000 13,290 17,663
Operating Segments | Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues 77,430 78,058 87,741
Income (loss) from equity affiliates 10 519 962
Other income (loss) 96 39 (8)
Total Revenues and Other Income 75,868 76,822 86,967
Purchased crude oil and products 62,921 61,731 71,208
Operating and SG&A expenses 6,034 6,058 5,094
Depreciation, depletion and amortization 360 301 311
Other costs and deduction 2,071 1,782 1,515
Total Costs and Other Deductions 71,386 69,872 78,128
Income Tax Expense (Benefit) 397 519 280
Less: Net income (loss) attributable to noncontrolling interests 56 14 92
Net income (loss) attributable to CUSA 1,196 2,233 2,761
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (52,818) (49,229) (51,344)
Intersegment Eliminations | Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (52,333) (48,765) (50,942)
Total Revenues and Other Income (183) (132) (72)
Intersegment Eliminations | All Other      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (485) (464) (402)
Total Revenues and Other Income 183 132 72
Intersegment Eliminations | U.S. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (29,662) (26,307) (29,870)
Total Revenues and Other Income 25,305 23,665 29,801
Intersegment Eliminations | U.S. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (9,745) (8,793) (5,529)
Total Revenues and Other Income (26,845) (23,887) (31,245)
Intersegment Eliminations | Int'l. | Upstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (11,258) (11,871) (13,815)
Total Revenues and Other Income 4,190 4,274 7,078
Intersegment Eliminations | Int'l. | Downstream      
Segment Reporting Information [Line Items]      
Sales and Other Operating Revenues (1,668) (1,794) (1,728)
Total Revenues and Other Income $ (2,833) $ (4,184) $ (5,706)