What was the change in Restructuring charges, net in 2019 from 2018?
{"": {"2019": "", "2018": "(in millions)", "2017": ""}, "Restructuring charges, net": {"2019": 255, "2018": 140, "2017": 146}, "Gain on divestiture": {"2019": "\u2014", "2018": -2, "2017": "\u2014"}, "Other charges (credits), net": {"2019": "\u2014", "2018": -12, "2017": 1}, "Restructuring and other charges, net": {"2019": 255, "2018": 126, "2017": 147}}
restructuring_charges_net_2019 = df["Restructuring charges, net"]["2019"]
restructuring_charges_net_2018 = df["Restructuring charges, net"]["2018"]
answer = restructuring_charges_net_2019 - restructuring_charges_net_2018