What was the total liabilities in 2018?
{"(In millions, except per share amounts) -- Year Ended June 30,": {"2019 (a)": 2019.0, "2018": 2018.0, "2017 (d)(e)": 2017.0, "2016 (d)": 2016.0, "2015": 2015.0}, "(In millions, except per share amounts) -- Revenue": {"2019 (a)": 125843.0, "2018": 110360.0, "2017 (d)(e)": 96571.0, "2016 (d)": 91154.0, "2015": 93580.0}, "(In millions, except per share amounts) -- Gross margin": {"2019 (a)": 82933.0, "2018": 72007.0, "2017 (d)(e)": 62310.0, "2016 (d)": 58374.0, "2015": 60542.0}, "(In millions, except per share amounts) -- Operating income": {"2019 (a)": 42959.0, "2018": 35058.0, "2017 (d)(e)": 29025.0, "2016 (d)": 26078.0, "2015": 18161.0}, "(In millions, except per share amounts) -- Net income": {"2019 (a)": 39240.0, "2018": 16571.0, "2017 (d)(e)": 25489.0, "2016 (d)": 20539.0, "2015": 12193.0}, "(In millions, except per share amounts) -- Diluted earnings per share": {"2019 (a)": 5.06, "2018": 2.13, "2017 (d)(e)": 3.25, "2016 (d)": 2.56, "2015": 1.48}, "(In millions, except per share amounts) -- Cash dividends declared per share": {"2019 (a)": 1.84, "2018": 1.68, "2017 (d)(e)": 1.56, "2016 (d)": 1.44, "2015": 1.24}, "Cash, cash equivalents, and short-term -- investments": {"2019 (a)": 133819.0, "2018": 133768.0, "2017 (d)(e)": 132981.0, "2016 (d)": 113240.0, "2015": 96526.0}, "Cash, cash equivalents, and short-term -- Total assets": {"2019 (a)": 286556.0, "2018": 258848.0, "2017 (d)(e)": 250312.0, "2016 (d)": 202897.0, "2015": 174303.0}, "Cash, cash equivalents, and short-term -- Long-term obligations": {"2019 (a)": 114806.0, "2018": 117642.0, "2017 (d)(e)": 106856.0, "2016 (d)": 66705.0, "2015": 44574.0}, "Cash, cash equivalents, and short-term -- Stockholders equity": {"2019 (a)": 102330.0, "2018": 82718.0, "2017 (d)(e)": 87711.0, "2016 (d)": 83090.0, "2015": 80083.0}}
total_liabilities_2018 = df["Cash, cash equivalents, and short-term -- Total assets"]["2018"]
total_equity_2018 = df["Cash, cash equivalents, and short-term -- Stockholders equity"]["2018"]
answer = total_liabilities_2018 - total_equity_2018