What is the percentage change in segment net revenues between 2018 and 2019?
{"Reconciliation to consolidated net revenues: -- Segment net revenues": {"2019": 5969, "2018": 6835}, "Reconciliation to consolidated net revenues: -- Revenues from non-reportable segments (1)": {"2019": 462, "2018": 480}, "Reconciliation to consolidated net revenues: -- Net effect from recognition (deferral) of deferred net revenues (2)": {"2019": 101, "2018": 238}, "Reconciliation to consolidated net revenues: -- Elimination of intersegment revenues (3)": {"2019": -43, "2018": -53}, "Reconciliation to consolidated net revenues: -- Consolidated net revenues": {"2019": 6489, "2018": 7500}, "Reconciliation to consolidated income before income tax expense: -- Segment operating income": {"2019": 2054, "2018": 2446}, "Reconciliation to consolidated income before income tax expense: -- Operating income (loss) from non-reportable segments (1)": {"2019": 24, "2018": 31}, "Reconciliation to consolidated income before income tax expense: -- Net effect from recognition (deferral) of deferred net revenues and related cost of revenues (2)": {"2019": 52, "2018": 100}, "Reconciliation to consolidated income before income tax expense: -- Share-based compensation expense": {"2019": -166, "2018": -209}, "Reconciliation to consolidated income before income tax expense: -- Amortization of intangible assets": {"2019": -203, "2018": -370}, "Reconciliation to consolidated income before income tax expense: -- Restructuring and related costs (4)": {"2019": -137, "2018": -10}, "Reconciliation to consolidated income before income tax expense: -- Discrete tax-related items (5)": {"2019": -17, "2018": "\u2014"}, "Reconciliation to consolidated income before income tax expense: -- Consolidated operating income": {"2019": 1607, "2018": 1988}, "Reconciliation to consolidated income before income tax expense: -- Interest and other expense (income), net": {"2019": -26, "2018": 71}, "Reconciliation to consolidated income before income tax expense: -- Loss on extinguishment of debt": {"2019": "\u2014", "2018": 40}, "Reconciliation to consolidated income before income tax expense: -- Consolidated income before income tax expense": {"2019": 1633, "2018": 1877}}
segment_net_revenues_2019 = df["Reconciliation to consolidated net revenues: -- Segment net revenues"]["2019"]
segment_net_revenues_2018 = df["Reconciliation to consolidated net revenues: -- Segment net revenues"]["2018"]
answer = ( segment_net_revenues_2019 - segment_net_revenues_2018 ) / segment_net_revenues_2018 * 100.0