Cash flow
| USD million | 2012* | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
| Net cash provided from operating activities | 1,825 | 1,333 | 1,806 | 1,622 | 1,699 | 1,899 | 2,741 |
| Net cash used in investing activities | -1,443 | -1,016 | -946 | -1,375 | -310 | -758 | +290 |
| Purchases and construction of property, plant and equipment | -1,453 | -756 | -563 | -595 | -559 | -592 | -680 |
| Net cash used in financing activities | -119 | -224 | -1,147 | -377 | -1,120 | -1,459 | -2,119 |
| Net increase / (decrease) in cash and cash equivalents | 263 | 94 | -284 | -130 | 269 | -318 | +912 |
Note:
*2012 results are presented in accordance with US GAAP; 2013-2017 results are presented in accordance with IFRS