AT&T promised it would create 7,000 jobs if Trump went through with its $3B tax-cut, but they cut 23,000 jobs instead

Yes, Billion is ambigious – but a bimillion or trimillion are far worse as logically they should be 2 x 10⁶ and 3 x 10⁶ respectively – you don’t get powers of ten with those prefixes, at least not with the decimal base system.