DETROIT (AP) — General Motors will recall about 7 million big pickup trucks and SUVs worldwide to replace potentially dangerous Takata air bag inflators.

The announcement came Monday after the U.S. government told the automaker it had to recall 6 million of the vehicles in the U.S.

GM says it will not fight the decision, even though it believes the vehicles are safe. It will cost the company an estimated $1.2 billion, about one third of its net income so far this year.

The automaker had petitioned the agency four times since 2016 to avoid recalls, contending the air bag inflator canisters have been safe on the road and in testing. But the National Highway Traffic Safety Administration on Monday denied the petitions, saying the inflators still run the risk of exploding.

Owners complained to the NHTSA that the company was placing profits over safety.

Exploding Takata inflators caused the largest series of auto recalls in U.S. history, with at least 63 million inflators recalled. The U.S. government says that as of September, more than 11.1 million had not been fixed. About 100 million inflators have been recalled worldwide.

Takata used volatile ammonium nitrate to create a small explosion to fill air bags in a crash. But the chemical can deteriorate when exposed to heat and humidity, and they can explode with too much pressure, blowing apart a metal canister and spewing shrapnel.

Twenty-seven people have been killed worldwide by the exploding inflators, including 18 in the U.S.

Monday’s decision by NHTSA is a major step in drawing the Takata saga to a close. It means that all Takata ammonium nitrate inflators in the U.S. will be recalled, NHTSA said. Earlier this year the agency decided against a recall of inflators with a moisture-absorbing chemical called a dessicant. NHTSA said it would monitor those inflators and take action if problems arise.

GM will recall full-size pickup trucks and SUVs from the 2007 through 2014 model years, including the Chevrolet Silverado 1500, 2500 and 3500 pickups. The Silverado is GM’s top-selling vehicle and the second-best selling vehicle in the U.S. Also covered are the Chevrolet Suburban, Tahoe and Avalanche, the Cadillac Escalade, GMC Sierra 1500, 2500 and 3500, and the GMC Yukon.

It took the agency more than four years to arrive at its decision, which comes toward the end of President Donald Trump’s four-year term.

NHTSA said in a prepared statement that it analyzed all available data on the air bags, including engineering and statistical analyses, aging tests and field data.

“Based on this information and information provided to the petition’s public docket, NHTSA concluded that the GM inflators in question are at risk of the same type of explosion after long-term exposure to high heat and humidity as other recalled Takata inflators,” the agency said.

The company has 30 days to give NHTSA a proposed schedule for notifying vehicle owners and starting the recall, the statement said.