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Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | $ 4,106 | $ 4,832 | $ 4,106 | $ 4,832 | $ 4,631 | $ 4,403
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | 2,678 | 1,829 |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures | (482) | (362) | (884) | (706) |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 0 | 0 |  |
Asset sales and other, net |  |  | (86) | 3 |  |
Net cash used in investing activities |  |  | (970) | (703) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 352 | 606 |  |
Repayments of debt |  |  | (2,297) | (1,250) |  |
Intercompany loans |  |  | 0 | 0 |  |
Cash dividends paid and contributions received, net |  |  | (314) | (41) |  |
Other, net |  |  | (18) | (19) |  |
Net cash used in financing activities |  |  | (2,277) | (704) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | (569) | 422 |  |
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale |  |  | 44 | 7 |  |
Eliminations [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 0 | 0 | 0 | 0 | 0 | 0
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | 0 | 0 |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Intercompany loans |  |  | 442 | 427 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | (2,564) | (1,078) |  |
Asset sales and other, net |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | (2,122) | (651) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 0 | 0 |  |
Repayments of debt |  |  | 0 | 0 |  |
Intercompany loans |  |  | (442) | (427) |  |
Cash dividends paid and contributions received, net |  |  | 2,548 | 1,025 |  |
Other, net |  |  | 16 | 53 |  |
Net cash used in financing activities |  |  | 2,122 | 651 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | 0 | 0 |  |
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale |  |  | 0 | 0 |  |
Reportable Legal Entities [Member] | FCX Issuer [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 0 | 0 | 0 | 0 | 0 | 0
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | (163) | (96) |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | (2) | 0 |  |
Intercompany loans |  |  | (442) | (427) |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 2,519 | 1,032 |  |
Asset sales and other, net |  |  | 4 | 0 |  |
Net cash used in investing activities |  |  | 2,079 | 605 |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 0 | 0 |  |
Repayments of debt |  |  | (1,826) | (499) |  |
Intercompany loans |  |  | 0 | 0 |  |
Cash dividends paid and contributions received, net |  |  | (73) | (2) |  |
Other, net |  |  | (17) | (8) |  |
Net cash used in financing activities |  |  | (1,916) | (509) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | 0 | 0 |  |
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale |  |  | 0 | 0 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 0 | 11 | 0 | 11 | 7 | 11
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | (184) | (284) |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | 0 | (23) |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 0 | (16) |  |
Asset sales and other, net |  |  | 1 | (5) |  |
Net cash used in investing activities |  |  | 1 | (44) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 0 | 0 |  |
Repayments of debt |  |  | (52) | 0 |  |
Intercompany loans |  |  | 228 | 337 |  |
Cash dividends paid and contributions received, net |  |  | 0 | 0 |  |
Other, net |  |  | 0 | (9) |  |
Net cash used in financing activities |  |  | 176 | 328 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | (7) | 0 |  |
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale |  |  | 0 | 0 |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | $ 4,106 | $ 4,821 | 4,106 | 4,821 | $ 4,624 | $ 4,392
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | 3,025 | 2,209 |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | (882) | (683) |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 45 | 62 |  |
Asset sales and other, net |  |  | (91) | 8 |  |
Net cash used in investing activities |  |  | (928) | (613) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 352 | 606 |  |
Repayments of debt |  |  | (419) | (751) |  |
Intercompany loans |  |  | 214 | 90 |  |
Cash dividends paid and contributions received, net |  |  | (2,789) | (1,064) |  |
Other, net |  |  | (17) | (55) |  |
Net cash used in financing activities |  |  | (2,659) | (1,174) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | (562) | 422 |  |
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale |  |  | $ 44 | $ 7 |  |

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