Considering her total physical single sales are of about 36 million and that according to the analysis 67% of her album sales comes from the US, I'd say we can calculate the percentage of about 67% of her total single sales, which the result is about 24.120.000. So she has probably sold from 20-25 million singles in the US.

According to Barbra recent memoir My Name Is Barbra by herself
https://www.vulture.com/2023/11/book-excerpt-barbra-streisand-broadway-album-stephen-sondheim.html
The Broadway Album it sold 7 and a half million copies worldwide, 40 percents higher than this article's figure, so her total physical album sales should be over 138,610,000 * 140%= 194 million, total csps over 215 million.