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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year $ 4,799 $ 5,129 $ 4,799 $ 5,129 $ 4,631 $ 4,403
Cash flow from operating activities:            
Net cash provided by operating activities     3,925 3,012    
Cash flow from investing activities:            
Capital expenditures (507) (314) (1,391) (1,020)    
Intercompany loans     0 0    
Dividends from (investments in) consolidated subsidiaries     0 0    
Asset sales and other, net     (81) 66    
Net cash used in investing activities     (1,472) (954)    
Cash flow from financing activities:            
Proceeds from debt     475 795    
Repayments of debt     (2,410) (1,991)    
Intercompany loans     0 0    
Cash dividends paid and contributions received, net     (386) (69)    
Other, net     (19) (22)    
Net cash used in financing activities     (2,340) (1,287)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect     113 771    
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale     55 (45)    
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     558 609    
Dividends from (investments in) consolidated subsidiaries     (2,791) (1,834)    
Asset sales and other, net     0 0    
Net cash used in investing activities     (2,233) (1,225)    
Cash flow from financing activities:            
Proceeds from debt     0 0    
Repayments of debt     0 0    
Intercompany loans     (558) (609)    
Cash dividends paid and contributions received, net     2,775 1,772    
Other, net     16 62    
Net cash used in financing activities     2,233 1,225    
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     (181) (222)    
Cash flow from investing activities:            
Capital expenditures     (2) 0    
Intercompany loans     (558) (609)    
Dividends from (investments in) consolidated subsidiaries     2,726 1,757    
Asset sales and other, net     4 0    
Net cash used in investing activities     2,170 1,148    
Cash flow from financing activities:            
Proceeds from debt     0 0    
Repayments of debt     (1,826) (915)    
Intercompany loans     0 0    
Cash dividends paid and contributions received, net     (145) (2)    
Other, net     (18) (9)    
Net cash used in financing activities     (1,989) (926)    
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 8 0 8 7 11
Cash flow from operating activities:            
Net cash provided by operating activities     (285) (383)    
Cash flow from investing activities:            
Capital expenditures     0 (24)    
Intercompany loans     0 0    
Dividends from (investments in) consolidated subsidiaries     0 (16)    
Asset sales and other, net     3 58    
Net cash used in investing activities     3 18    
Cash flow from financing activities:            
Proceeds from debt     0 0    
Repayments of debt     (52) (139)    
Intercompany loans     327 512    
Cash dividends paid and contributions received, net     0 0    
Other, net     0 (11)    
Net cash used in financing activities     275 362    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect     (7) (3)    
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 $ 4,799 $ 5,121 4,799 5,121 $ 4,624 $ 4,392
Cash flow from operating activities:            
Net cash provided by operating activities     4,391 3,617    
Cash flow from investing activities:            
Capital expenditures     (1,389) (996)    
Intercompany loans     0 0    
Dividends from (investments in) consolidated subsidiaries     65 93    
Asset sales and other, net     (88) 8    
Net cash used in investing activities     (1,412) (895)    
Cash flow from financing activities:            
Proceeds from debt     475 795    
Repayments of debt     (532) (937)    
Intercompany loans     231 97    
Cash dividends paid and contributions received, net     (3,016) (1,839)    
Other, net     (17) (64)    
Net cash used in financing activities     (2,859) (1,948)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect     120 774    
Increase (Decrease) In Cash And Cash Equivalents In Assets Held For Sale     $ 55 $ (45)