| Free cash flow (in US$ millions) | Q4 2017 | Q3 2017 | Q2 2017 | Q1 2017 | FY 2017 | Q4 2016 | Q3 2016 | Q2 2016 | Q1 2016 | FY 2016 |
| Net cash from operating activities | 587 | 463 | 369 | 289 | 1,707 | 378 | 332 | 192 | 141 | 1,043 |
| Net cash used in investing activities | (442) | (482) | (317) | (227) | (1,468) | (243) | (230) | (144) | (110) | (727) |
| Payment for purchase and proceeds from sale of marketable securities, investment in short-term deposits, restricted cash | - | 99 | - | - | 99 | - | - | - | - | - |
| Free cash flow - Non-U.S. GAAP | 145 | 80 | 52 | 62 | 338 | 135 | 102 | 48 | 31 | 316 |
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