What was the change in gross carrying amount between the 2022 and 2026 notes?
{"2021 Notes": {"Gross Carrying Amount": 650, "Unamortized Discount and Deferred Financing Costs": -3, "Net Carrying Amount": 647}, "2022 Notes": {"Gross Carrying Amount": 400, "Unamortized Discount and Deferred Financing Costs": -3, "Net Carrying Amount": 397}, "2026 Notes": {"Gross Carrying Amount": 850, "Unamortized Discount and Deferred Financing Costs": -8, "Net Carrying Amount": 842}, "2027 Notes": {"Gross Carrying Amount": 400, "Unamortized Discount and Deferred Financing Costs": -5, "Net Carrying Amount": 395}, "2047 Notes": {"Gross Carrying Amount": 400, "Unamortized Discount and Deferred Financing Costs": -10, "Net Carrying Amount": 390}, "Total debt": {"Gross Carrying Amount": 2700, "Unamortized Discount and Deferred Financing Costs": -29, "Net Carrying Amount": 2671}}
gross_carrying_amount_2026 = df["2026 Notes"]["Gross Carrying Amount"]
gross_carrying_amount_2022 = df["2022 Notes"]["Gross Carrying Amount"]
answer = gross_carrying_amount_2026 - gross_carrying_amount_2022