* AIG to hold 30 pct in AIA for year after listing-term sheet
* AIA cannot issue new shares for six months after listing (Adds details, background)
HONG KONG, Sept 27 (Reuters) - American International Group Inc will be required to hold a 30 percent stake in its Asian life insurance business, AIA Group Ltd, for a year after AIA's listing next month, the term sheet showed on Monday.
AIA's share offering is expected to raise about $15 billion, which will help its parent AIG to return part of the aid it received from the U.S. government during the financial crisis.
AIA began pre-marketing for the IPO on Monday to gauge demand and is expected to set a price range in coming weeks.
AIA was likely to sign up cornerstone investors during pre-marketing, ahead of its schedule to list on Oct. 29, sources previously told Reuters..
The cornerstone investors would be subject to a lock-in period of six months, the term sheet showed.
AIA's management team is in advanced talks with several Middle Eastern and Asian sovereign funds to sell cornerstone stakes in AIA, which is the next major step in AIA's listing process.
Over the weekend, AIG said AIA would likely post a pre-tax operating profit of at least $2 billion for the fiscal year ending in November.
AIG, nearly 80 percent owned by the U.S. government, is disposing of assets to repay taxpayers who committed $182.3 billion to prop up the insurer during the financial crisis.
AIA would be unable to sell new shares within six months of listing, the term sheet showed.
Citigroup Inc, Deutsche Bank AG, Goldman Sachs Group Inc and Morgan Stanley are joint global coordinators for the IPO. (US$1=HK$7.75) (Reporting by Kennix Chim and Denny Thomas; Editing by Chris Lewis)