The company said in a statement that the market, including infrastructure as a service, platform as a service, and software as a service, grew 26.0% year-on-year in 2019.
The share of the market that went to the top five firms was said to be expanding at 35% year-on-year.
"Cloud is expanding far beyond niche e-commerce and online ad-sponsored searches," said Rick Villars, group vice president, Worldwide Research at IDC.
"Enterprises talked about cloud journeys of up to 10 years. Now they are looking to complete the shift in less than half that time."
IDC said the public cloud service market had more than doubled since 2016, with spending on IaaS and PaaS nearly tripling.
"Today's economic uncertainty draws fresh attention to the core benefits of IaaS – low financial commitment, flexibility to support business agility, and operational resilience," said Deepak Mohan, research director, Cloud Infrastructure Services.
"Cost optimisation and business resilience have emerged as top drivers of IT investment decisions and IaaS offerings are designed to enable both.
"The COVID-19 disruption has accelerated cloud adoption with both traditional enterprise IT organisations and digital service providers increasing use of IaaS for their technology platforms."