Major insurer UnitedHealth, which caused a stir in the fall by saying it might leave Obamacare, lost $720 million from the individual health insurance market last year.

However, the country's largest insurer still made a ton of money.

UnitedHealth said in its financial report released Tuesday that the $720 million comes from losses "related to the individual exchange-compliant insurance business." The individual marketplace includes Obamacare.

About $245 million of that money was for "advance recognition of losses" in 2016 in the individual marketplace.

But things weren't all bad for United, as total revenue in 2015, which includes employer-sponsored insurance and retirement insurance, grew 20 percent from 2014 to $157 billion.

United said in the fall that mounting losses in Obamacare's marketplaces have forced the insurer to consider leaving the exchanges. The insurer said it has lost about $425 million due to poor enrollment in the exchanges.

That move could hurt competition on the marketplaces.

United's news in the fall sent insurance stocks into a tailspin, and other major insurers such as Anthem and Cigna said that they remain committed to Obamacare. Cigna did say in December that it hasn't made any money in Obamacare's exchanges.