Table:
|  |  | Year Ended December 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
|  |  | (In millions) |  |
| Net cash from operating activities | $1,869 | $1,845 | $1,677 |
| Net cash used in investing activities | (1,172) | (1,212) | (1,468) |
| Net cash used in financing activities | (343) | (122) | (106) |
| Effect of changes in exchange rates | (13) | (4) | 27 |
| Net cash increase | $341 | $507 | $130 |
Paragraphs:
Net cash from operating activities. Net cash from operating activities is the sum of (i) net income (loss) adjusted for non-cash items and (ii) changes in net working capital. The net cash from operating activities in 2019 was $1,869 million, increasing compared to $1,845 million in the prior year, mainly due to more favorable changes in net working capital, compensating lower net income.
Net cash used in investing activities. Investing activities used $1,172 million of cash in 2019, decreasing from $1,212 million in the prior year. Payments for purchase of tangible assets, net of proceeds, totaled $1,174 million, compared to $1,262 million registered in the prior-year period. The 2019 numbers also included the proceeds from matured marketable securities of $200 million and the net cash outflow of $127 million for the acquisition of Norstel.
Net cash used in financing activities. Net cash used in financing activities was $343 million for 2019, compared to the $122 million used in 2018. The 2019 amount included $281 million proceeds from long-term debt, $144 million of long-term debt repayment, $250 million of repurchase of common stock and $214 million of dividends paid to stockholders.
Question:
What led to increase in net cash from operating activities in 2019?
Answer: mainly due to more favorable changes in net working capital, compensating lower net income.