| (US$ Million) | Sep 29
2018 | Jun 30
2018 | Mar 31 2018 | Dec 31 2017 | Sep 30 2017 |
| Cash and cash equivalents | 1,835 | 1,683 | 1,791 | 1,759 | 2,188 |
| Short term deposits | 8 | 15 | 14 | - | - |
| Marketable securities | 328 | 429 | 429 | 431 | 433 |
| Total financial resources | 2,171 | 2,127 | 2,234 | 2,190 | 2,621 |
| Short-term debt | (117) | (118) | (119) | (118) | (486) |
| Long-term debt | (1,607) | (1,598) | (1,593) | (1,583) | (1,689) |
| Total financial debt | (1,724) | (1,716) | (1,712) | (1,701) | (2,175) |
| Net financial position | 447 | 411 | 522 | 489 | 446 |
Free cash flow (non-U.S. GAAP measure) is defined as net cash from operating activities minus net cash from (used in) investing activities, excluding payment for purchases (proceeds from the sale of) marketable securities, short-term deposits and restricted cash. We believe free cash flow provides useful information for investors and management because it measures our capacity to generate cash from our operating and investing activities to sustain our operating activities. Free cash flow does not represent total cash flow since it does not include the cash flows generated by or used in financing activities. In addition, our definition of free cash flow may differ from definitions used by other companies.
| (US$ Million) | Q3 2018 | Q2 2018 | Q1 2018 | Q4 2017 | Q3 2017(1) |
| Net cash from operating activities | 373 | 360 | 455 | 587 | 433 |
| Net cash used in investing activities | (152) | (401) | (374) | (442) | (482) |
| Payment for purchase and proceeds from sale of marketable securities, investment in short-term deposits, restricted cash | (107) | 1 | 14 | - | 99 |
| Free cash flow | 114 | (40) | 95 | 145 | 50 |
(1) Q3 2017 amounts have been adjusted to reflect the impact of new 2018 accounting guidance, which requires, on comparative periods,
the reclassification as operating cash flows of the implied interest paid in the settlement of our convertible bonds.
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