December 31, 2010 Level 1 Level 2 Level 3 Total NT$ NT$ NT$ NT$ (In Millions) Assets Derivatives - currency swap contracts $  —  $  34  $  —  $  34  Convertible bonds 43  —  43  Available-for-sale securities Open-end mutual funds 1,562  —  —  1,562  Domestic listed stocks 527  527  Corporate bonds —  102  —  102  $  2,132  $  136  $  $  2,268  Convertible bonds are actively traded or have quoted prices. For forward exchange and currency swap  contracts, fair values are estimated using industry standard valuation models. These models use market- based observable inputs including interest rate curves, foreign exchange rates, and forward and spot prices  for currencies to project fair value.  Available-for-sale financial assets include open-end mutual funds, domestic listed stocks, foreign listed  stocks, and real estate investment trust fund that are actively traded or have quoted prices.  Corporate bonds are valued using market-based observable inputs including duration, yield rate and credit  rating.  The tables below set out the balances for those assets required to be measured at fair value on a  nonrecurring basis and the associated losses recognized during the years ended December 31, 2009 and  2010:  F-78 Assets measured at fair value on a nonrecurring basis  For the Year Ended December 31, 2009 Level 1 Level 2 Level 3 Total  Losses NT$ NT$ NT$ NT$ (In Millions) Assets Cost method investees - ETS, and DIG $  — $  — $  24 $  20 Other assets  — 5 For the Year Ended December 31, 2010 Level 1 Level 2 Level 3 Total  Losses NT$ NT$ NT$ NT$ (In Millions) Assets Cost method investees –DIG, A2P, ChipSip and CMI $  —  $  —  $  40  $  59  Other assets 28  66 