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Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | $ 2,512 | $ 4,823 | $ 2,512 | $ 4,823 | $ 4,455 | $ 4,710
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | 1,312 | 3,925 |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures | (666) | (507) | (1,917) | (1,391) |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | (2) | 0 |  |
Proceeds From Divestiture Of Business And Interests In Affiliates And Proceeds From Sale Of Other Assets |  |  | 94 | (81) |  |
Net cash used in investing activities |  |  | (1,825) | (1,472) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 1,681 | 475 |  |
Repayments of debt |  |  | (2,917) | (2,410) |  |
Intercompany loans |  |  | 0 | 0 |  |
Cash dividends paid and contributions received, net |  |  | (164) | (386) |  |
Other, net |  |  | (30) | (19) |  |
Net cash used in financing activities |  |  | (1,430) | (2,340) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | (1,943) | 113 |  |
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 |  |  | 801 | 558 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | (1,769) | (2,791) |  |
Proceeds From Divestiture Of Business And Interests In Affiliates And Proceeds From Sale Of Other Assets |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | (968) | (2,233) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 0 | 0 |  |
Repayments of debt |  |  | 0 | 0 |  |
Intercompany loans |  |  | (802) | (558) |  |
Cash dividends paid and contributions received, net |  |  | 1,750 | 2,775 |  |
Other, net |  |  | 20 | 16 |  |
Net cash used in financing activities |  |  | 968 | 2,233 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | 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 |  |  | 352 | (181) |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | 0 | (2) |  |
Intercompany loans |  |  | (801) | (558) |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 1,697 | 2,726 |  |
Proceeds From Divestiture Of Business And Interests In Affiliates And Proceeds From Sale Of Other Assets |  |  | (1) | 4 |  |
Net cash used in investing activities |  |  | 895 | 2,170 |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 1,200 | 0 |  |
Repayments of debt |  |  | (2,202) | (1,826) |  |
Intercompany loans |  |  | 0 | 0 |  |
Cash dividends paid and contributions received, net |  |  | (218) | (145) |  |
Other, net |  |  | (27) | (18) |  |
Net cash used in financing activities |  |  | (1,247) | (1,989) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | 0 | 0 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | 0 | 0 | 0 | 0 | 0 | 7
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | (326) | (285) |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | (4) | 0 |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 0 | 0 |  |
Proceeds From Divestiture Of Business And Interests In Affiliates And Proceeds From Sale Of Other Assets |  |  | 98 | 3 |  |
Net cash used in investing activities |  |  | 94 | 3 |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 0 | 0 |  |
Repayments of debt |  |  | 0 | (52) |  |
Intercompany loans |  |  | 232 | 327 |  |
Cash dividends paid and contributions received, net |  |  | 0 | 0 |  |
Other, net |  |  | 0 | 0 |  |
Net cash used in financing activities |  |  | 232 | 275 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | 0 | (7) |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year | $ 2,512 | $ 4,823 | 2,512 | 4,823 | $ 4,455 | $ 4,703
Cash flow from operating activities: |  |  |  |  |  |
Net cash provided by operating activities |  |  | 1,286 | 4,391 |  |
Cash flow from investing activities: |  |  |  |  |  |
Capital expenditures |  |  | (1,913) | (1,389) |  |
Intercompany loans |  |  | 0 | 0 |  |
Dividends from (investments in) consolidated subsidiaries |  |  | 70 | 65 |  |
Proceeds From Divestiture Of Business And Interests In Affiliates And Proceeds From Sale Of Other Assets |  |  | (3) | (88) |  |
Net cash used in investing activities |  |  | (1,846) | (1,412) |  |
Cash flow from financing activities: |  |  |  |  |  |
Proceeds from debt |  |  | 481 | 475 |  |
Repayments of debt |  |  | (715) | (532) |  |
Intercompany loans |  |  | 570 | 231 |  |
Cash dividends paid and contributions received, net |  |  | (1,696) | (3,016) |  |
Other, net |  |  | (23) | (17) |  |
Net cash used in financing activities |  |  | (1,383) | (2,859) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  | $ (1,943) | $ 120 |  |

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