Oil giant BP has agreed to pay the largest criminal penalty in U.S. history, totaling billions of dollars, for the 2010 oil spill in the Gulf of Mexico, a person familiar with the deal said Thursday.

The person, who spoke on condition of anonymity because they were not authorized to speak on the record about the deal, also said two BP PLC employees face manslaughter charges over the death of 11 people in the explosion of the Deepwater Horizon oil rig that triggered the massive spill.

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The cost of BP's spill far surpassed the Exxon Valdez spill in 1989. Exxon ultimately settled with the U.S. government for $1 billion, which would be about $1.8 billion today.

The government and plaintiffs' attorneys also sued Transocean Ltd., the rig's owner, and cement contractor Halliburton, but a string of pretrial rulings by a federal judge undermined BP's legal strategy to pin blame on them.