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Supplementary Information - Condensed Consolidating Financial Information Balance Sheet (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets      
Cash and cash equivalents $ 5,088,000,000 $ 5,915,000,000  
Short-term investments 3,028,000,000 248,000,000  
Accounts and notes receivable 3,401,000,000 4,067,000,000  
Investment in Cenovus Energy 2,111,000,000 1,462,000,000  
Inventories 1,026,000,000 1,007,000,000  
Prepaid expenses and other current assets 2,259,000,000 575,000,000  
Total Current Assets 16,913,000,000 13,274,000,000  
Investments and long-term receivables 8,906,000,000 9,664,000,000  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 42,269,000,000 45,698,000,000  
Other assets 2,426,000,000 1,344,000,000  
Total Assets 70,514,000,000 69,980,000,000 $ 73,362,000,000
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable 3,200,000,000 3,895,000,000  
Short-term debt 105,000,000 112,000,000  
Accrued income and other taxes 1,030,000,000 1,320,000,000  
Employee benefit obligations 663,000,000 809,000,000  
Other accruals 2,045,000,000 1,259,000,000  
Total Current Liabilities 7,043,000,000 7,395,000,000  
Long-term debt 14,790,000,000 14,856,000,000  
Long-term asset retirement obligations and accrued environmental costs 5,352,000,000 7,688,000,000  
Long Term Deferred income taxes 4,634,000,000 5,021,000,000  
Employee benefit obligations 1,781,000,000 1,764,000,000  
Other liabilities and deferred credits 1,864,000,000 1,192,000,000  
Total Liabilities 35,464,000,000 37,916,000,000  
Retained earnings 39,742,000,000 34,010,000,000  
Other common stockholders' equity (4,761,000,000) (2,071,000,000)  
Noncontrolling interests 69,000,000 125,000,000  
Total Liabilities and Equity 70,514,000,000 69,980,000,000  
ConocoPhillips [Member]      
Assets      
Cash and cash equivalents 0 0  
Short-term investments 0 0  
Accounts and notes receivable 5,000,000 28,000,000  
Investment in Cenovus Energy 0 0  
Inventories 0 0  
Prepaid expenses and other current assets 1,000,000 1,000,000  
Total Current Assets 6,000,000 29,000,000  
Investments and long-term receivables 34,076,000,000 29,942,000,000  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 0 0  
Other assets 3,000,000 4,000,000  
Total Assets 34,085,000,000 29,975,000,000  
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable 0 0  
Short-term debt (3,000,000) (3,000,000)  
Accrued income and other taxes 0 0  
Employee benefit obligations 0 0  
Other accruals 84,000,000 85,000,000  
Total Current Liabilities 81,000,000 82,000,000  
Long-term debt 3,794,000,000 3,791,000,000  
Long-term asset retirement obligations and accrued environmental costs 0 0  
Long Term Deferred income taxes 0 0  
Employee benefit obligations 0 0  
Other liabilities and deferred credits 1,787,000,000 725,000,000  
Total Liabilities 5,662,000,000 4,598,000,000  
Retained earnings 33,184,000,000 27,512,000,000  
Other common stockholders' equity (4,761,000,000) (2,135,000,000)  
Noncontrolling interests 0 0  
Total Liabilities and Equity 34,085,000,000 29,975,000,000  
Reportable Legal Entities [Member] | ConocoPhillips Company [Member]      
Assets      
Cash and cash equivalents 3,439,000,000 1,428,000,000  
Short-term investments 2,670,000,000 0  
Accounts and notes receivable 2,088,000,000 5,646,000,000  
Investment in Cenovus Energy 2,111,000,000 1,462,000,000  
Inventories 168,000,000 184,000,000  
Prepaid expenses and other current assets 352,000,000 267,000,000  
Total Current Assets 10,828,000,000 8,987,000,000  
Investments and long-term receivables 44,969,000,000 47,062,000,000  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 3,552,000,000 4,367,000,000  
Other assets 765,000,000 642,000,000  
Total Assets 60,114,000,000 61,058,000,000  
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable 2,670,000,000 5,098,000,000  
Short-term debt 4,000,000 12,000,000  
Accrued income and other taxes 79,000,000 85,000,000  
Employee benefit obligations 508,000,000 638,000,000  
Other accruals 408,000,000 587,000,000  
Total Current Liabilities 3,669,000,000 6,420,000,000  
Long-term debt 6,670,000,000 7,151,000,000  
Long-term asset retirement obligations and accrued environmental costs 322,000,000 415,000,000  
Long Term Deferred income taxes 0 0  
Employee benefit obligations 1,329,000,000 1,340,000,000  
Other liabilities and deferred credits 7,514,000,000 9,277,000,000  
Total Liabilities 19,504,000,000 24,603,000,000  
Retained earnings 21,898,000,000 18,511,000,000  
Other common stockholders' equity 18,712,000,000 17,944,000,000  
Noncontrolling interests 0 0  
Total Liabilities and Equity 60,114,000,000 61,058,000,000  
Reportable Legal Entities [Member] | Burlington Resources LLC [Member]      
Assets      
Cash and cash equivalents 0 0  
Short-term investments 0 0  
Accounts and notes receivable 2,000,000 78,000,000  
Investment in Cenovus Energy 0 0  
Inventories 0 0  
Prepaid expenses and other current assets 0 0  
Total Current Assets 2,000,000 78,000,000  
Investments and long-term receivables 11,662,000,000 15,199,000,000  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 0 0  
Other assets 253,000,000 227,000,000  
Total Assets 11,917,000,000 15,504,000,000  
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable 21,000,000 76,000,000  
Short-term debt 13,000,000 13,000,000  
Accrued income and other taxes 0 0  
Employee benefit obligations 0 0  
Other accruals 35,000,000 35,000,000  
Total Current Liabilities 69,000,000 124,000,000  
Long-term debt 2,129,000,000 2,143,000,000  
Long-term asset retirement obligations and accrued environmental costs 0 0  
Long Term Deferred income taxes 0 0  
Employee benefit obligations 0 0  
Other liabilities and deferred credits 826,000,000 839,000,000  
Total Liabilities 3,024,000,000 3,106,000,000  
Retained earnings 2,164,000,000 1,113,000,000  
Other common stockholders' equity 6,729,000,000 11,285,000,000  
Noncontrolling interests 0 0  
Total Liabilities and Equity 11,917,000,000 15,504,000,000  
Reportable Legal Entities [Member] | All Other Subsidiaries [Member]      
Assets      
Cash and cash equivalents 1,649,000,000 4,487,000,000  
Short-term investments 358,000,000 248,000,000  
Accounts and notes receivable 3,881,000,000 6,707,000,000  
Investment in Cenovus Energy 0 0  
Inventories 858,000,000 823,000,000  
Prepaid expenses and other current assets 1,906,000,000 307,000,000  
Total Current Assets 8,652,000,000 12,572,000,000  
Investments and long-term receivables 15,612,000,000 16,926,000,000  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 38,717,000,000 41,796,000,000  
Other assets 2,210,000,000 1,269,000,000  
Total Assets 65,191,000,000 72,563,000,000  
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable 3,084,000,000 7,113,000,000  
Short-term debt 91,000,000 99,000,000  
Accrued income and other taxes 951,000,000 1,235,000,000  
Employee benefit obligations 155,000,000 171,000,000  
Other accruals 1,518,000,000 552,000,000  
Total Current Liabilities 5,799,000,000 9,170,000,000  
Long-term debt 2,197,000,000 2,249,000,000  
Long-term asset retirement obligations and accrued environmental costs 5,030,000,000 7,273,000,000  
Long Term Deferred income taxes 5,438,000,000 5,819,000,000  
Employee benefit obligations 452,000,000 424,000,000  
Other liabilities and deferred credits 9,271,000,000 8,126,000,000  
Total Liabilities 28,187,000,000 33,061,000,000  
Retained earnings 10,481,000,000 9,764,000,000  
Other common stockholders' equity 26,454,000,000 29,613,000,000  
Noncontrolling interests 69,000,000 125,000,000  
Total Liabilities and Equity 65,191,000,000 72,563,000,000  
Consolidating Adjustments [Member]      
Assets      
Cash and cash equivalents 0 0  
Short-term investments 0 0  
Accounts and notes receivable (2,575,000,000) (8,392,000,000)  
Investment in Cenovus Energy 0 0  
Inventories 0 0  
Prepaid expenses and other current assets 0 0  
Total Current Assets (2,575,000,000) (8,392,000,000)  
Investments and long-term receivables (97,413,000,000) (99,465,000,000)  
Net properties, plants and equipment (net of accumulated depreciation, depletion and amortization of $55,477 million in 2019 and $64,899 million in 2018) 0 (465,000,000)  
Other assets (805,000,000) (798,000,000)  
Total Assets (100,793,000,000) (109,120,000,000)  
Liabilities and Stockholders Equity      
Accounts payable and related party accounts payable (2,575,000,000) (8,392,000,000)  
Short-term debt 0 (9,000,000)  
Accrued income and other taxes 0 0  
Employee benefit obligations 0 0  
Other accruals 0 0  
Total Current Liabilities (2,575,000,000) (8,401,000,000)  
Long-term debt 0 (478,000,000)  
Long-term asset retirement obligations and accrued environmental costs 0 0  
Long Term Deferred income taxes (804,000,000) (798,000,000)  
Employee benefit obligations 0 0  
Other liabilities and deferred credits (17,534,000,000) (17,775,000,000)  
Total Liabilities (20,913,000,000) (27,452,000,000)  
Retained earnings (27,985,000,000) (22,890,000,000)  
Other common stockholders' equity (51,895,000,000) (58,778,000,000)  
Noncontrolling interests 0 0  
Total Liabilities and Equity $ (100,793,000,000) $ (109,120,000,000)