What is the increase/ (decrease) in Net cash from operating activities from the period 2017 to 2019?
{"": {"2019": "", "2018": "(In millions)", "2017": ""}, "Net cash from operating activities": {"2019": 1869, "2018": 1845, "2017": 1677}, "Net cash used in investing activities": {"2019": -1172, "2018": -1212, "2017": -1468}, "Net cash used in financing activities": {"2019": -343, "2018": -122, "2017": -106}, "Effect of changes in exchange rates": {"2019": -13, "2018": -4, "2017": 27}, "Net cash increase": {"2019": 341, "2018": 507, "2017": 130}}
net_cash_from_operating_activities_2019 = df["Net cash from operating activities"]["2019"]
net_cash_from_operating_activities_2017 = df["Net cash from operating activities"]["2017"]
answer = net_cash_from_operating_activities_2019 - net_cash_from_operating_activities_2017