(Reuters) -Amazon will raise $15 billion from its first U.S. dollar bond offering in three years, according to a filing with the Securities and Exchange Commission on Monday, as big tech firms ramp up investments in AI infrastructure. Big technology firms are turning to debt sales worth tens of billions of dollars to fund infrastructure expansions as demand for artificial intelligence workloads surges. The e-commerce giant filed for a six-part bond sale earlier on Monday. Proceeds may be used for everything, from acquisitions and capital expenditures to share buybacks. At the peak, the bond attracted about $80 billion of demand, according to Bloomberg News, which first reported the development. Pricing discussions for the longest portion of the deal, a 40-year bond, tightened to 0.85 perce

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