But the company sold more of its noncarbonated drinks worldwide, and its earnings matched expectations.
The Atlanta-based company says global sales volume rose 2 per cent. In its flagship North American market, soda volume slipped 1 per cent as the company raised prices.
Coca-Cola Co, which also makes drinks including Sprite, Powerade and Dasani, has been under pressure to deliver stronger results, particularly back at home where Americans have been cutting back on soda for years.
The company isn't alone in its struggles to boost soda sales. PepsiCo Inc, which reports its earnings on Thursday, has seen even steeper declines in its soda business despite stepped-up marketing, including sponsorship of the Super Bowl halftime show.
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"Look, we have Coca-Cola, and we have another 500 brands. The key is to offer a wide variety of choices," CEO Muhtar Kent said in an interview on CNBC regarding the concerns about soda.
To boost sales, the company plans slash costs and put the savings into marketing in the year ahead. It also introduced a version of its namesake soda sweetened with a mix of stevia and sugar in Argentina, with plans to eventually introduce the drink elsewhere.