Million is commonly abbreviated in financial documents or letters. In these documents, million is generally abbreviated as: - M (also m or m.)
The word “million” is defined as the number 1,000,000. When plural, as in “millions,” it refers to multiples of 1,000,000.
MM is generally used in business to represent millions since the letter M by itself has historically meant 1,000.
If you’re looking to avoid the word million altogether, you won’t have much luck. The only other option is to write your entire number numerically.