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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