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Supplementary Information - Condensed Consolidating Financial Information Income Statement (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues and Other Income      
Revenue from contracts with customers [1] $ 32,567,000,000 $ 36,417,000,000 $ 29,106,000,000
Equity in earnings of affiliates 779,000,000 1,074,000,000 772,000,000
Gain on dispositions 1,966,000,000 1,063,000,000 2,177,000,000
Other income (loss) 1,358,000,000 173,000,000 529,000,000
Intercompany revenues 0 0 0
Total Revenues and Other Income 36,670,000,000 38,727,000,000 32,584,000,000
Cost and expenses [Abstract]      
Purchased commodities 11,842,000,000 14,294,000,000 12,475,000,000
Production and operating expenses 5,322,000,000 5,213,000,000 5,162,000,000
Selling, general and administrative expenses 556,000,000 401,000,000 [2] 427,000,000 [2]
Exploration expenses 743,000,000 369,000,000 [2] 934,000,000 [2]
Depreciation, depletion and amortization 6,090,000,000 5,956,000,000 6,845,000,000
Impairments 405,000,000 27,000,000 6,601,000,000
Taxes other than income taxes 953,000,000 1,048,000,000 809,000,000
Accretion on discounted liabilities 326,000,000 353,000,000 362,000,000
Interest and debt expense 778,000,000 735,000,000 1,098,000,000
Foreign currency transaction (gains) losses 66,000,000 (17,000,000) 35,000,000
Other Non Operating Expense 65,000,000 375,000,000 [2] 451,000,000 [2]
Total Costs and Expenses 27,146,000,000 28,754,000,000 35,199,000,000
Income (loss) before income taxes 9,524,000,000 9,973,000,000 (2,615,000,000)
Income Tax Expense (Benefit) 2,267,000,000 3,668,000,000 (1,822,000,000)
Net income (loss) 7,257,000,000 6,305,000,000 (793,000,000)
Less: net income attributable to noncontrolling interests (68,000,000) (48,000,000) (62,000,000)
Net income (loss) attributable to ConocoPhillips 7,189,000,000 6,257,000,000 (855,000,000)
Comprehensive Income (Loss) Attributable to ConocoPhillips 7,935,000,000 5,654,000,000 (180,000,000)
ConocoPhillips [Member]      
Revenues and Other Income      
Revenue from contracts with customers 0 0 0
Equity in earnings of affiliates 7,419,000,000 6,503,000,000 (454,000,000)
Gain on dispositions 0 0 0
Other income (loss) 1,000,000 0 2,000,000
Intercompany revenues 0 35,000,000 48,000,000
Total Revenues and Other Income 7,420,000,000 6,538,000,000 (404,000,000)
Cost and expenses [Abstract]      
Purchased commodities 0 0 0
Production and operating expenses 1,000,000 0 0
Selling, general and administrative expenses 9,000,000 8,000,000 9,000,000
Exploration expenses 0 0 0
Depreciation, depletion and amortization 0 0 0
Impairments 0 0 0
Taxes other than income taxes 0 0 0
Accretion on discounted liabilities 0 0 0
Interest and debt expense 283,000,000 295,000,000 420,000,000
Foreign currency transaction (gains) losses 0 46,000,000 (43,000,000)
Other Non Operating Expense 0 0 267,000,000
Total Costs and Expenses 293,000,000 349,000,000 653,000,000
Income (loss) before income taxes 7,127,000,000 6,189,000,000 (1,057,000,000)
Income Tax Expense (Benefit) (62,000,000) (68,000,000) (202,000,000)
Net income (loss) 7,189,000,000 6,257,000,000 (855,000,000)
Less: net income attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to ConocoPhillips 7,189,000,000 6,257,000,000 (855,000,000)
Comprehensive Income (Loss) Attributable to ConocoPhillips 7,935,000,000 5,654,000,000 (180,000,000)
Reportable Legal Entities [Member] | ConocoPhillips Company [Member]      
Revenues and Other Income      
Revenue from contracts with customers 14,510,000,000 16,113,000,000 12,433,000,000
Equity in earnings of affiliates 5,281,000,000 8,142,000,000 2,047,000,000
Gain on dispositions 2,786,000,000 239,000,000 916,000,000
Other income (loss) 875,000,000 (384,000,000) 35,000,000
Intercompany revenues 113,000,000 162,000,000 291,000,000
Total Revenues and Other Income 23,565,000,000 24,272,000,000 15,722,000,000
Cost and expenses [Abstract]      
Purchased commodities 12,838,000,000 14,591,000,000 11,145,000,000
Production and operating expenses 1,380,000,000 1,023,000,000 813,000,000
Selling, general and administrative expenses 421,000,000 289,000,000 342,000,000
Exploration expenses 422,000,000 170,000,000 542,000,000
Depreciation, depletion and amortization 596,000,000 584,000,000 855,000,000
Impairments 157,000,000 (10,000,000) 1,159,000,000
Taxes other than income taxes 139,000,000 143,000,000 140,000,000
Accretion on discounted liabilities 16,000,000 17,000,000 32,000,000
Interest and debt expense 544,000,000 613,000,000 664,000,000
Foreign currency transaction (gains) losses 21,000,000 (12,000,000) 11,000,000
Other Non Operating Expense 60,000,000 349,000,000 190,000,000
Total Costs and Expenses 16,594,000,000 17,757,000,000 15,893,000,000
Income (loss) before income taxes 6,971,000,000 6,515,000,000 (171,000,000)
Income Tax Expense (Benefit) (448,000,000) 12,000,000 283,000,000
Net income (loss) 7,419,000,000 6,503,000,000 (454,000,000)
Less: net income attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to ConocoPhillips 7,419,000,000 6,503,000,000 (454,000,000)
Comprehensive Income (Loss) Attributable to ConocoPhillips 8,165,000,000 5,900,000,000 221,000,000
Reportable Legal Entities [Member] | Burlington Resources LLC [Member]      
Revenues and Other Income      
Revenue from contracts with customers 0 0 0
Equity in earnings of affiliates 1,610,000,000 1,953,000,000 886,000,000
Gain on dispositions 0 0 0
Other income (loss) 5,000,000 0 0
Intercompany revenues 40,000,000 43,000,000 13,000,000
Total Revenues and Other Income 1,655,000,000 1,996,000,000 899,000,000
Cost and expenses [Abstract]      
Purchased commodities 0 0 0
Production and operating expenses 1,000,000 4,000,000 0
Selling, general and administrative expenses 0 0 0
Exploration expenses 0 0 0
Depreciation, depletion and amortization 0 0 0
Impairments 0 0 0
Taxes other than income taxes 0 0 1,000,000
Accretion on discounted liabilities 0 0 0
Interest and debt expense 133,000,000 46,000,000 52,000,000
Foreign currency transaction (gains) losses 0 116,000,000 (137,000,000)
Other Non Operating Expense 0 6,000,000 0
Total Costs and Expenses 134,000,000 172,000,000 (84,000,000)
Income (loss) before income taxes 1,521,000,000 1,824,000,000 983,000,000
Income Tax Expense (Benefit) (46,000,000) (41,000,000) (337,000,000)
Net income (loss) 1,567,000,000 1,865,000,000 1,320,000,000
Less: net income attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to ConocoPhillips 1,567,000,000 1,865,000,000 1,320,000,000
Comprehensive Income (Loss) Attributable to ConocoPhillips 1,873,000,000 1,364,000,000 1,672,000,000
Reportable Legal Entities [Member] | All Other Subsidiaries [Member]      
Revenues and Other Income      
Revenue from contracts with customers 18,057,000,000 20,304,000,000 16,673,000,000
Equity in earnings of affiliates 775,000,000 1,072,000,000 770,000,000
Gain on dispositions (820,000,000) 824,000,000 1,261,000,000
Other income (loss) 477,000,000 557,000,000 492,000,000
Intercompany revenues 5,542,000,000 5,627,000,000 3,369,000,000
Total Revenues and Other Income 24,031,000,000 28,384,000,000 22,565,000,000
Cost and expenses [Abstract]      
Purchased commodities 4,038,000,000 5,131,000,000 4,580,000,000
Production and operating expenses 4,345,000,000 4,245,000,000 4,366,000,000
Selling, general and administrative expenses 131,000,000 109,000,000 82,000,000
Exploration expenses 321,000,000 199,000,000 392,000,000
Depreciation, depletion and amortization 5,494,000,000 5,372,000,000 5,990,000,000
Impairments 248,000,000 37,000,000 5,442,000,000
Taxes other than income taxes 814,000,000 905,000,000 668,000,000
Accretion on discounted liabilities 310,000,000 336,000,000 330,000,000
Interest and debt expense 69,000,000 156,000,000 410,000,000
Foreign currency transaction (gains) losses 45,000,000 (167,000,000) 204,000,000
Other Non Operating Expense 5,000,000 20,000,000 (6,000,000)
Total Costs and Expenses 15,820,000,000 16,343,000,000 22,458,000,000
Income (loss) before income taxes 8,211,000,000 12,041,000,000 107,000,000
Income Tax Expense (Benefit) 2,823,000,000 3,765,000,000 (1,566,000,000)
Net income (loss) 5,388,000,000 8,276,000,000 1,673,000,000
Less: net income attributable to noncontrolling interests (68,000,000) (48,000,000) (62,000,000)
Net income (loss) attributable to ConocoPhillips 5,320,000,000 8,228,000,000 1,611,000,000
Comprehensive Income (Loss) Attributable to ConocoPhillips 6,058,000,000 7,961,000,000 2,275,000,000
Consolidating Adjustments [Member]      
Revenues and Other Income      
Revenue from contracts with customers 0 0 0
Equity in earnings of affiliates (14,306,000,000) (16,596,000,000) (2,477,000,000)
Gain on dispositions 0 0 0
Other income (loss) 0 0 0
Intercompany revenues (5,695,000,000) (5,867,000,000) (3,721,000,000)
Total Revenues and Other Income (20,001,000,000) (22,463,000,000) (6,198,000,000)
Cost and expenses [Abstract]      
Purchased commodities (5,034,000,000) (5,428,000,000) (3,250,000,000)
Production and operating expenses (405,000,000) (59,000,000) (17,000,000)
Selling, general and administrative expenses (5,000,000) (5,000,000) (6,000,000)
Exploration expenses 0 0 0
Depreciation, depletion and amortization 0 0 0
Impairments 0 0 0
Taxes other than income taxes 0 0 0
Accretion on discounted liabilities 0 0 0
Interest and debt expense (251,000,000) (375,000,000) (448,000,000)
Foreign currency transaction (gains) losses 0 0 0
Other Non Operating Expense 0 0 0
Total Costs and Expenses (5,695,000,000) (5,867,000,000) (3,721,000,000)
Income (loss) before income taxes (14,306,000,000) (16,596,000,000) (2,477,000,000)
Income Tax Expense (Benefit) 0 0 0
Net income (loss) (14,306,000,000) (16,596,000,000) (2,477,000,000)
Less: net income attributable to noncontrolling interests 0 0 0
Net income (loss) attributable to ConocoPhillips (14,306,000,000) (16,596,000,000) (2,477,000,000)
Comprehensive Income (Loss) Attributable to ConocoPhillips $ (16,096,000,000) $ (15,225,000,000) $ (4,168,000,000)
[1] <div>(1)Sales and other operating revenues are attributable to countries based on the location of the selling operation.</div>
[2]
See Notes to Consolidated Financial Statements.