.0 billion . the commercial paper program is currently supported by the 2017 credit facility . at december 31 , 2017 , blackrock had no cp notes outstanding . long-term borrowings the carrying value and fair value of long-term borrowings estimated using market prices and foreign exchange rates at december 31 , 2017 included the following : ( in millions ) maturity amount unamortized discount and debt issuance costs carrying value fair value .