MetLife Inc. may use stock to pay for more than half of the planned $15 billion purchase of an American International Group Inc. life insurance unit, said three people with knowledge of the matter.

MetLife plans to pay AIG about $8 billion in stock and the rest in cash for American Life Insurance Co., said the people, who spoke on condition of anonymity because the talks are private. Some of the cash may come from a $5 billion bridge loan from banks including JPMorgan Chase & Co., Bank of America Corp., Deutsche Bank AG and Credit Suisse Group AG, the people said.

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