We don't know exactly how much cash Nintendo has because they haven't reported since late July (they will update us again on Monday). That said, some of the estimates on this thread are embarrassingly off.
Nintendo's last report showed that as of June 30th, they had 702 billion yen of cash and 251 billion yen in "short term securities." When investors calculate a firm's cash, they typically add up these two lines, since short term securities can quickly be converted to cash (companies sometimes call ST securities "cash equivalents").
If you use the current 113.7 yen dollar exchange rate, Nintendo had $8.38 billion US dollars in cash/ST securities at June 30th. However, that number is higher now because several months have passed, and also because Nintendo stores much of their cash in US dollars, and the dollar has recently strengthened against the yen.
TLDR: Nintendo has more than $8 billion USD of cash and equivalents.
