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Supplementary Information - Condensed Consolidating Financial Information - Bal Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Cash and cash equivalents |  | $ 3,716 | $ 6,325
Short-term investments |  | 875 | 1,873
Accounts and notes receivable |  | 4,499 | 4,320
Investment in Cenovus Energy |  | 2,086 | 1,899
Inventories |  | 1,239 | 1,060
Prepaid expenses and other current assets |  | 2,308 | 1,035
Total Current Assets |  | 14,723 | 16,512
Investments and long-term receiavables |  | 9,888 | 10,060
Net properties, plants and equipment |  | 44,736 | 45,683
Other assets |  | 1,209 | 1,107
Total Assets |  | 70,556 | 73,362
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | 3,918 | 4,030
Short-term debt |  | 95 | 2,575
Accrued income and other taxes |  | 1,582 | 1,038
Employee benefit obligations |  | 626 | 725
Other accruals |  | 1,180 | 1,029
Total Current Liabilities |  | 7,401 | 9,397
Long-term debt |  | 14,902 | 17,128
Asset retirement obligations and accrued environmental costs |  | 7,554 | 7,631
Deferred income taxes |  | 5,535 | 5,282
Employee benefit obligations |  | 1,755 | 1,854
Other liabilities and deferred credits |  | 1,330 | 1,269
Total Liabilities |  | 38,477 | 42,561
Retained earnings |  | 32,495 | 29,391
Other common stockholders' equity |  | (545) | 1,216
Noncontrolling interests |  | 129 | 194
Total Liabilities and Stockholders' Equity | [1] | 70,556 | 73,362
ConocoPhillips - [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 0 | 0
Short-term investments |  | 0 | 0
Accounts and notes receivable |  | 6 | 24
Investment in Cenovus Energy |  | 0 | 0
Inventories |  | 0 | 0
Prepaid expenses and other current assets |  | 0 | 1
Total Current Assets |  | 6 | 25
Investments and long-term receiavables |  | 31,249 | 29,400
Net properties, plants and equipment |  | 0 | 0
Other assets |  | 19 | 15
Total Assets |  | 31,274 | 29,440
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | 0 | 0
Short-term debt |  | (3) | (5)
Accrued income and other taxes |  | 0 | 0
Employee benefit obligations |  | 0 | 0
Other accruals |  | 57 | 85
Total Current Liabilities |  | 54 | 80
Long-term debt |  | 3,790 | 3,787
Asset retirement obligations and accrued environmental costs |  | 0 | 0
Deferred income taxes |  | 0 | 0
Employee benefit obligations |  | 0 | 0
Other liabilities and deferred credits |  | 2,042 | 1,528
Total Liabilities |  | 5,886 | 5,395
Retained earnings |  | 25,972 | 22,867
Other common stockholders' equity |  | (584) | 1,178
Noncontrolling interests |  | 0 | 0
Total Liabilities and Stockholders' Equity |  | 31,274 | 29,440
Consolidating Adjustments [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 0 | 0
Short-term investments |  | 0 | 0
Accounts and notes receivable |  | (3,423) | (2,864)
Investment in Cenovus Energy |  | 0 | 0
Inventories |  | 0 | 0
Prepaid expenses and other current assets |  | (27) | (29)
Total Current Assets |  | (3,450) | (2,893)
Investments and long-term receiavables |  | (96,295) | (84,897)
Net properties, plants and equipment |  | (468) | (477)
Other assets |  | (930) | (1,542)
Total Assets |  | (101,143) | (89,809)
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | (3,423) | (2,864)
Short-term debt |  | (9) | (9)
Accrued income and other taxes |  | 0 | 0
Employee benefit obligations |  | 0 | 0
Other accruals |  | (27) | (30)
Total Current Liabilities |  | (3,459) | (2,903)
Long-term debt |  | (478) | (477)
Asset retirement obligations and accrued environmental costs |  | 0 | 0
Deferred income taxes |  | (433) | (981)
Employee benefit obligations |  | 0 | 0
Other liabilities and deferred credits |  | (20,400) | (15,629)
Total Liabilities |  | (24,770) | (19,990)
Retained earnings |  | (27,360) | (18,070)
Other common stockholders' equity |  | (49,013) | (51,749)
Noncontrolling interests |  | 0 | 0
Total Liabilities and Stockholders' Equity |  | (101,143) | (89,809)
Reportable Legal Entities [Member] | ConocoPhillips Company [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 16 | 234
Short-term investments |  | 0 | 0
Accounts and notes receivable |  | 2,614 | 2,255
Investment in Cenovus Energy |  | 2,086 | 1,899
Inventories |  | 198 | 163
Prepaid expenses and other current assets |  | 159 | 278
Total Current Assets |  | 5,073 | 4,829
Investments and long-term receiavables |  | 51,482 | 47,974
Net properties, plants and equipment |  | 4,495 | 4,230
Other assets |  | 484 | 1,146
Total Assets |  | 61,534 | 58,179
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | 3,444 | 3,094
Short-term debt |  | 12 | 2,505
Accrued income and other taxes |  | 104 | 107
Employee benefit obligations |  | 476 | 554
Other accruals |  | 404 | 314
Total Current Liabilities |  | 4,440 | 6,574
Long-term debt |  | 7,152 | 9,321
Asset retirement obligations and accrued environmental costs |  | 424 | 432
Deferred income taxes |  | 0 | 0
Employee benefit obligations |  | 1,315 | 1,335
Other liabilities and deferred credits |  | 11,064 | 5,229
Total Liabilities |  | 24,395 | 22,891
Retained earnings |  | 17,591 | 13,317
Other common stockholders' equity |  | 19,548 | 21,971
Noncontrolling interests |  | 0 | 0
Total Liabilities and Stockholders' Equity |  | 61,534 | 58,179
Reportable Legal Entities [Member] | ConocoPhillips Canada Funding Company I [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 0 | 4
Short-term investments |  | 0 | 0
Accounts and notes receivable |  | 1 | 35
Investment in Cenovus Energy |  | 0 | 0
Inventories |  | 0 | 0
Prepaid expenses and other current assets |  | 7 | 6
Total Current Assets |  | 8 | 45
Investments and long-term receiavables |  | 2,623 | 2,533
Net properties, plants and equipment |  | 0 | 0
Other assets |  | 178 | 186
Total Assets |  | 2,809 | 2,764
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | 7 | 1
Short-term debt |  | 7 | 7
Accrued income and other taxes |  | 0 | 0
Employee benefit obligations |  | 0 | 0
Other accruals |  | 51 | 48
Total Current Liabilities |  | 65 | 56
Long-term debt |  | 1,698 | 1,703
Asset retirement obligations and accrued environmental costs |  | 0 | 0
Deferred income taxes |  | 0 | 0
Employee benefit obligations |  | 0 | 0
Other liabilities and deferred credits |  | 981 | 926
Total Liabilities |  | 2,744 | 2,685
Retained earnings |  | (614) | (681)
Other common stockholders' equity |  | 679 | 760
Noncontrolling interests |  | 0 | 0
Total Liabilities and Stockholders' Equity |  | 2,809 | 2,764
Reportable Legal Entities [Member] | All Other Subsidiaries [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 3,700 | 6,087
Short-term investments |  | 875 | 1,873
Accounts and notes receivable |  | 5,301 | 4,870
Investment in Cenovus Energy |  | 0 | 0
Inventories |  | 1,041 | 897
Prepaid expenses and other current assets |  | 2,169 | 779
Total Current Assets |  | 13,086 | 14,506
Investments and long-term receiavables |  | 20,829 | 15,050
Net properties, plants and equipment |  | 40,709 | 41,930
Other assets |  | 1,458 | 1,302
Total Assets |  | 76,082 | 72,788
Liabilities and Stockholders' Equity |  |  |
Accounts payable |  | 3,890 | 3,799
Short-term debt |  | 88 | 77
Accrued income and other taxes |  | 1,478 | 931
Employee benefit obligations |  | 150 | 171
Other accruals |  | 695 | 612
Total Current Liabilities |  | 6,301 | 5,590
Long-term debt |  | 2,740 | 2,794
Asset retirement obligations and accrued environmental costs |  | 7,130 | 7,199
Deferred income taxes |  | 5,968 | 6,263
Employee benefit obligations |  | 440 | 519
Other liabilities and deferred credits |  | 7,643 | 9,215
Total Liabilities |  | 30,222 | 31,580
Retained earnings |  | 16,906 | 11,958
Other common stockholders' equity |  | 28,825 | 29,056
Noncontrolling interests |  | 129 | 194
Total Liabilities and Stockholders' Equity |  | $ 76,082 | $ 72,788
[1] | See Notes to Consolidated Financial Statements.

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