REUTERS/Rebecca Cook
That compensation includes a $1.6 million salary, $2.8 million in short-term incentives, and about $10 million in long-term compensation.
GM had not planned to release the long-term compensation figure until its proxy filing in April, but changed its mind after it was accused of underpaying its first female CEO by Fox News and others.
"As a new CEO, Mary's total compensation is in line with her peer group and properly weighted so that most is at-risk," said GM Chairman Tim Solso said in a statement. "The company's performance will ultimately determine how much she is paid."