What is 16 billion in USD (US dollars)?
The US dollar (currency code: USD) is the official currency of the United States of America and the most traded currency in the world. A dollar comprises 100 cents (¢) and is also referred to as buck and greenback. It is represented by the $ sign which is used by other currencies as well. The sign is believed to have arisen from overwriting a p with an s when used to represent Spanish pesos (also known as dollars).
The word dollar itself has its roots in the German taler, an abbreviation of Joachimstaler, the name given to coins minted near the town of Joachimstal. $100 bills are referred to in slang as Benjamins (after Benjamin Franklin whose portrait is on them). $20 bills are similarly known as Jacksons (after Andrew Jackson). 1000 dollars is a grand while 5¢ is a nickel, 10¢ a dime, and 25¢, a quarter.