Reply #13: This mentions $750bn.

[FlashHarry]

BBC News

On edit: So does this

<snip>
his threat comes as foreign investment in the US dries up because of business scandals, lower corporate earnings and the collapse of the technology boom. According to government figures, foreigners put $124 billion into the US last year, down from $301 billion in 2000.

Economists say the reluctance of wealthy outsiders to expand their business interests in America is a major threat to the world's largest economy.

Saudi investors have $750 billion in the US. A mass walkout would seriously impede the US's attempts to pull away from recession.
</snip>