NEW DELHI, Dec. 10 -- Amazon Inc. on Wednesday sharply raised the scale of its India ambition, outlining plans to invest more than $35 billion across its businesses by 2030, a move that will take its cumulative investment in the country to $75 billion by the end of the decade.

The announcement marks one of Amazon's strongest signals yet that India remains a priority growth market even as competition intensifies and the company pushes to expand its logistics, cloud and digital infrastructure.

The new commitment also marks a steep jump from a July blog post, where Amazon had said its total investments in India would reach $26 billion by 2030. The fresh guidance underscores how the company is recasting its India plans around business expan...