What is the increase / (decrease) in the Non-U.S. DB plans from 2018 to 2019?
{"($ in millions) -- For the year ended December 31:": {"2019": 2019, "2018": 2018}, "($ in millions) -- Non-U.S. DB plans": {"2019": 243, "2018": 325}, "($ in millions) -- Non pension postretirement benefit plans": {"2019": 304, "2018": 335}, "($ in millions) -- Multi-employer plans": {"2019": 32, "2018": 38}, "($ in millions) -- DC plans": {"2019": 1040, "2018": 1024}, "($ in millions) -- Direct benefit payments": {"2019": 559, "2018": 567}, "($ in millions) -- Total": {"2019": 2177, "2018": 2288}}
non_us_db_plans_2019 = df["($ in millions) -- Non-U.S. DB plans"]["2019"]
non_us_db_plans_2018 = df["($ in millions) -- Non-U.S. DB plans"]["2018"]
answer = non_us_db_plans_2019 - non_us_db_plans_2018