What is the change in Accumulated other comprehensive income from December 31, 2017 to January 1, 2018?
{"Retained earnings": {"At December 31, 2017": 35635, "Topic 606": 2890, "ASU 2018-02": -652, "Other ASUs": -6, "At January 1, 2018": 37867}, "Accumulated other comprehensive income": {"At December 31, 2017": 2659, "Topic 606": "\u2014", "ASU 2018-02": 652, "Other ASUs": -22, "At January 1, 2018": 3289}, "Noncontrolling interests": {"At December 31, 2017": 1591, "Topic 606": 44, "ASU 2018-02": "\u2014", "Other ASUs": "\u2014", "At January 1, 2018": 1635}}
acc_comp_income_jan_1_2018 = df["Accumulated other comprehensive income"]["At January 1, 2018"]
acc_comp_income_dec_31_2017 = df["Accumulated other comprehensive income"]["At December 31, 2017"]
answer = acc_comp_income_jan_1_2018 - acc_comp_income_dec_31_2017