What was the increase / (decrease) in cash and cash equivalents from 2018 to 2019?
{"": {"2019": "", "2018": "(In millions)", "2017": ""}, "Cash and cash equivalents": {"2019": 2597, "2018": 2266, "2017": 1759}, "Restricted cash": {"2019": 10, "2018": "\u2014", "2017": "\u2014"}, "Short-term deposits": {"2019": 4, "2018": "\u2014", "2017": "\u2014"}, "Marketable securities": {"2019": 133, "2018": 330, "2017": 431}, "Total financial resources": {"2019": 2744, "2018": 2596, "2017": 2190}, "Short-term debt, including bank overdrafts": {"2019": -173, "2018": -146, "2017": -118}, "Long-term debt": {"2019": -1899, "2018": -1764, "2017": -1583}, "Total financial debt": {"2019": -2072, "2018": -1910, "2017": -1701}, "Net Financial Position": {"2019": 672, "2018": 686, "2017": 489}}
cash_and_cash_equivalents_2019 = df["Cash and cash equivalents"]["2019"]
cash_and_cash_equivalents_2018 = df["Cash and cash equivalents"]["2018"]
answer = cash_and_cash_equivalents_2019 - cash_and_cash_equivalents_2018