For information regarding the securities portfolio as of December 31, 2018 and 2017, and for the years ended December 31, 2018 and 2017, refer to Note 10. Investment securities portfolio 2016 (Unaudited) December 31, (in millions) Amortized cost Fair  value Available-for-sale securities Mortgage-backed securities: U.S Government agencies $ 63,367 $ 64,005 U.S. Treasury and government agencies 44,822 44,101 All other AFS securities 128,241 130,785 Total available-for-sale securities $ 236,430 $ 238,891 Held-to-maturity securities Mortgage-backed securities: U.S Government agencies 29,910 30,511 All other HTM securities 20,258 20,378 Total held-to-maturity securities $ 50,168 $ 50,889 Total investment securities $ 286,598 $ 289,780 300