What is the change in the total acquisition-related expense in 2019 from 2018?
{"": {"2019": "", "2018": "(Dollars in millions)", "2017": ""}, "Transaction-related expenses": {"2019": "$\u2014", "2018": 2, "2017": 174}, "Integration and transformation-related expenses": {"2019": 234, "2018": 391, "2017": 97}, "Total acquisition-related expenses": {"2019": 234, "2018": 393, "2017": 271}}
integration_and_transformation_related_expenses_2019 = df["Integration and transformation-related expenses"]["2019"]
total_acquisition_related_expenses_2018 = df["Total acquisition-related expenses"]["2018"]
answer = integration_and_transformation_related_expenses_2019 - total_acquisition_related_expenses_2018