Amazon.com Inc. plans to spend almost $150 billion in the coming 15 years on data centers, giving the cloud-computing giant the firepower to handle an expected explosion in demand for artificial intelligence applications and other digital services. The spending spree is a show of force as the company looks to maintain its grip on the cloud services market, where it holds about twice the share of No. 2 player Microsoft Corp. Sales growth at Amazon Web Services slowed to a record low last year as ...