How to use "billion" in a sentence

Three billion dollars, the largest single part of the Network's yearly budget, came from the Department of Health and Welfare

Chipping three billion out of Health was the least risky of the Network's funding operations, for Health was so gigantic that it never missed such a petty sum

The Department of Defense, which was less flush than Health and Welfare these days, was nevertheless also guilty of waste, and it was good for at least another billion a year

Lesser amounts, ranging from only one hundred million to as much as half a billion, were secretly extracted from the Department of Energy, the Department of Education, and other government bodies on an annual basis.