What was the increase / (decrease) in the Selling, general and administrative—other from 2018 to 2019?
{"($ in millions) -- For the year ended December 31:": {"2019": 2019, "2018": 2018, "Yr.-to-Yr. Percent Change": "Yr.-to-Yr. Percent Change"}, "Selling, general and administrative expense -- Selling, general and administrativeother": {"2019": 17099.0, "2018": 16438.0, "Yr.-to-Yr. Percent Change": 4.0}, "Selling, general and administrative expense -- Advertising and promotional expense": {"2019": 1647.0, "2018": 1466.0, "Yr.-to-Yr. Percent Change": 12.3}, "Selling, general and administrative expense -- Workforce rebalancing charges": {"2019": 555.0, "2018": 598.0, "Yr.-to-Yr. Percent Change": -7.2}, "Selling, general and administrative expense -- Amortization of acquired intangible assets": {"2019": 762.0, "2018": 435.0, "Yr.-to-Yr. Percent Change": 74.9}, "Selling, general and administrative expense -- Stock-based compensation": {"2019": 453.0, "2018": 361.0, "Yr.-to-Yr. Percent Change": 25.2}, "Selling, general and administrative expense -- Bad debt expense": {"2019": 89.0, "2018": 67.0, "Yr.-to-Yr. Percent Change": 32.5}, "Selling, general and administrative expense -- Total consolidated selling, general and administrative expense": {"2019": 20604.0, "2018": 19366.0, "Yr.-to-Yr. Percent Change": 6.4}, "Non-operating adjustments -- Amortization of acquired intangible assets": {"2019": -762.0, "2018": -435.0, "Yr.-to-Yr. Percent Change": 74.9}, "Non-operating adjustments -- Acquisition-related charges": {"2019": -282, "2018": -15, "Yr.-to-Yr. Percent Change": "NM"}, "Non-operating adjustments -- Operating (non-GAAP) selling, general and administrative expense": {"2019": 19560.0, "2018": 18915.0, "Yr.-to-Yr. Percent Change": 3.4}}
selling_general_and_administrative_other_2019 = df["Selling, general and administrative expense -- Selling, general and administrativeother"]["2019"]
selling_general_and_administrative_other_2018 = df["Selling, general and administrative expense -- Selling, general and administrativeother"]["2018"]
answer = selling_general_and_administrative_other_2019 - selling_general_and_administrative_other_2018