What was the increase / (decrease) in Total consolidated expense and other (income) from 2018 to 2019?
{"($ in millions) -- For the fourth quarter:": {"2019": 2019.0, "2018": 2018.0, "Yr.-to-Yr. Percent/ Margin Change*": "Yr.-to-Yr. Percent/ Margin Change*"}, "($ in millions) -- Total consolidated expense and other (income)": {"2019": 7107.0, "2018": 6253.0, "Yr.-to-Yr. Percent/ Margin Change*": 13.7}, "Non-operating adjustments -- Amortization of acquired intangible assets": {"2019": -294.0, "2018": -106.0, "Yr.-to-Yr. Percent/ Margin Change*": 176.0}, "Non-operating adjustments -- Acquisition-related charges": {"2019": -27.0, "2018": -13.0, "Yr.-to-Yr. Percent/ Margin Change*": 104.7}, "Non-operating adjustments -- Non-operating retirement related (costs)/income": {"2019": -196.0, "2018": -387.0, "Yr.-to-Yr. Percent/ Margin Change*": -49.4}, "Non-operating adjustments -- Operating (non-GAAP) expense and other (income)": {"2019": 6591.0, "2018": 5746.0, "Yr.-to-Yr. Percent/ Margin Change*": 14.7}, "Non-operating adjustments -- Total consolidated expense-to-revenue ratio": {"2019": 32.6, "2018": 28.7, "Yr.-to-Yr. Percent/ Margin Change*": 3.9}, "Non-operating adjustments -- Operating (non-GAAP) expense-to-revenue ratio": {"2019": 30.3, "2018": 26.4, "Yr.-to-Yr. Percent/ Margin Change*": 3.9}}
total_expense_2019 = df["($ in millions) -- Total consolidated expense and other (income)"]["2019"]
total_expense_2018 = df["($ in millions) -- Total consolidated expense and other (income)"]["2018"]
answer = total_expense_2019 - total_expense_2018