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Supplementary Information - Condensed Consolidating Financial Information - Cash Flow (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | $ 9,151 |  | $ 4,596
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | (5,133) |  | (3,074)
Working capital changes associated with investing activities | (57) |  | (18)
Proceeds from asset dispositions | 394 |  | 13,740
Net sales (purchases) of short-term investments | 996 |  | (2,583)
Long-term advances/loans-related parties | 0 |  | 0
Collection of advances/loans-related parties | 119 |  | 115
Intercompany cash management | 0 |  | 0
Other | 16 |  | 51
Net Cash Provided by (Used in) Investing Activities | (3,665) |  | 8,231
Cash Flows From Financing Activities |  |  |
Issuance of debt | 0 |  | 0
Repayment of debt | (4,970) |  | (6,594)
Issuance of company common stock | 121 |  | (65)
Repurchase of company common stock | (2,073) |  | (2,045)
Dividends paid | (1,009) |  | (986)
Other | (111) |  | (80)
Net Cash Provided by (Used in) Financing Activities | (8,042) |  | (9,770)
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | (40) |  | 244
Net Change in Cash and Cash Equivalents and Restricted Cash | (2,596) |  | 3,301
Cash and Cash Equivalents and Restricted Cash at beginning of period | 6,536 | [1] | 3,610
Cash and Cash Equivalents and Restricted Cash at end of period | 3,940 | [2] | 6,911
ConocoPhillips - [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | 2,331 |  | (161)
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | 0 |  | 0
Working capital changes associated with investing activities | 0 |  | 0
Proceeds from asset dispositions | 0 |  | 5,000
Net sales (purchases) of short-term investments | 0 |  | 0
Long-term advances/loans-related parties | 0 |  | 0
Collection of advances/loans-related parties | 0 |  | 658
Intercompany cash management | 514 |  | 2,903
Other | 0 |  | 0
Net Cash Provided by (Used in) Investing Activities | 514 |  | 8,561
Cash Flows From Financing Activities |  |  |
Issuance of debt | 0 |  | 0
Repayment of debt | 0 |  | (5,459)
Issuance of company common stock | 234 |  | 87
Repurchase of company common stock | (2,073) |  | (2,045)
Dividends paid | (1,009) |  | (986)
Other | 3 |  | 3
Net Cash Provided by (Used in) Financing Activities | (2,845) |  | (8,400)
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | 0 |  | 0
Net Change in Cash and Cash Equivalents and Restricted Cash | 0 |  | 0
Cash and Cash Equivalents and Restricted Cash at beginning of period | 0 |  | 0
Cash and Cash Equivalents and Restricted Cash at end of period | 0 |  | 0
Reportable Legal Entities [Member] | ConocoPhillips Company [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | 863 |  | 634
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | (771) |  | (1,230)
Working capital changes associated with investing activities | (77) |  | 36
Proceeds from asset dispositions | 307 |  | 10,974
Net sales (purchases) of short-term investments | 0 |  | 0
Long-term advances/loans-related parties | (36) |  | (74)
Collection of advances/loans-related parties | 3,432 |  | 127
Intercompany cash management | 3,426 |  | (2,474)
Other | 0 |  | 0
Net Cash Provided by (Used in) Investing Activities | 6,281 |  | 7,359
Cash Flows From Financing Activities |  |  |
Issuance of debt | 10 |  | 20
Repayment of debt | (4,865) |  | (3,146)
Issuance of company common stock | 0 |  | 0
Repurchase of company common stock | 0 |  | 0
Dividends paid | 0 |  | 0
Other | (2,511) |  | (5,000)
Net Cash Provided by (Used in) Financing Activities | (7,366) |  | (8,126)
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | 4 |  | 1
Net Change in Cash and Cash Equivalents and Restricted Cash | (218) |  | (132)
Cash and Cash Equivalents and Restricted Cash at beginning of period | 234 |  | 358
Cash and Cash Equivalents and Restricted Cash at end of period | 16 |  | 226
Reportable Legal Entities [Member] | ConocoPhillips Canada Funding Company I [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | (121) |  | 22
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | 0 |  | 0
Working capital changes associated with investing activities | 0 |  | 0
Proceeds from asset dispositions | 0 |  | 0
Net sales (purchases) of short-term investments | 0 |  | 0
Long-term advances/loans-related parties | 0 |  | 0
Collection of advances/loans-related parties | 0 |  | 0
Intercompany cash management | 0 |  | 0
Other | 0 |  | 0
Net Cash Provided by (Used in) Investing Activities | 0 |  | 0
Cash Flows From Financing Activities |  |  |
Issuance of debt | 117 |  | 0
Repayment of debt | 0 |  | 0
Issuance of company common stock | 0 |  | 0
Repurchase of company common stock | 0 |  | 0
Dividends paid | 0 |  | 0
Other | 0 |  | 0
Net Cash Provided by (Used in) Financing Activities | 117 |  | 0
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | 0 |  | 0
Net Change in Cash and Cash Equivalents and Restricted Cash | (4) |  | 22
Cash and Cash Equivalents and Restricted Cash at beginning of period | 4 |  | 13
Cash and Cash Equivalents and Restricted Cash at end of period | 0 |  | 35
Reportable Legal Entities [Member] | All Other Subsidiaries [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | 8,937 |  | 6,868
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | (4,369) |  | (2,711)
Working capital changes associated with investing activities | 20 |  | (54)
Proceeds from asset dispositions | 199 |  | 12,737
Net sales (purchases) of short-term investments | 996 |  | (2,583)
Long-term advances/loans-related parties | (127) |  | (20)
Collection of advances/loans-related parties | 129 |  | 2,196
Intercompany cash management | (3,940) |  | (429)
Other | 16 |  | 51
Net Cash Provided by (Used in) Investing Activities | (7,076) |  | 9,187
Cash Flows From Financing Activities |  |  |
Issuance of debt | 36 |  | 74
Repayment of debt | (3,547) |  | (855)
Issuance of company common stock | 0 |  | 0
Repurchase of company common stock | 0 |  | 0
Dividends paid | (452) |  | (2,919)
Other | (228) |  | (9,187)
Net Cash Provided by (Used in) Financing Activities | (4,191) |  | (12,887)
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | (44) |  | 243
Net Change in Cash and Cash Equivalents and Restricted Cash | (2,374) |  | 3,411
Cash and Cash Equivalents and Restricted Cash at beginning of period | 6,298 |  | 3,239
Cash and Cash Equivalents and Restricted Cash at end of period | 3,924 |  | 6,650
Consolidating Adjustments [Member] |  |  |
Cash Flows From Operating Activities |  |  |
Net cash provided by (used in) operating activities | (2,859) |  | (2,767)
Cash Flows From Investing Activities |  |  |
Capital expenditures and investments | 7 |  | 867
Working capital changes associated with investing activities | 0 |  | 0
Proceeds from asset dispositions | (112) |  | (14,971)
Net sales (purchases) of short-term investments | 0 |  | 0
Long-term advances/loans-related parties | 163 |  | 94
Collection of advances/loans-related parties | (3,442) |  | (2,866)
Intercompany cash management | 0 |  | 0
Other | 0 |  | 0
Net Cash Provided by (Used in) Investing Activities | (3,384) |  | (16,876)
Cash Flows From Financing Activities |  |  |
Issuance of debt | (163) |  | (94)
Repayment of debt | 3,442 |  | 2,866
Issuance of company common stock | (113) |  | (152)
Repurchase of company common stock | 0 |  | 0
Dividends paid | 452 |  | 2,919
Other | 2,625 |  | 14,104
Net Cash Provided by (Used in) Financing Activities | 6,243 |  | 19,643
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash | 0 |  | 0
Net Change in Cash and Cash Equivalents and Restricted Cash | 0 |  | 0
Cash and Cash Equivalents and Restricted Cash at beginning of period | 0 |  | 0
Cash and Cash Equivalents and Restricted Cash at end of period | $ 0 |  | $ 0
[1] | *Restated to include $211 million of restricted cash at January 1, 2018. See Note 2—Changes in Accounting Principles for additional information relating to the adoption of ASU No. 2016-18.
[2] | Restricted cash totaling $224 million is included in the "Other assets" line of our Consolidated Balance Sheet as of September 30, 2018.

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