Los Angeles announced the deal Friday for its two-time Stanley Cup-winning cornerstone.
After cracking the Kings' roster as an 18-year-old, Doughty has been among the NHL's top defensemen throughout a 10-year career spent entirely with the Kings.
He won the Norris Trophy as the league's best defenseman in 2016. As an aggressive, skilled two-way blueliner, he has been a finalist for the award in three other seasons -- including 2017-18, when he scored a career-high 60 points while playing in all 82 games for the fourth consecutive season.
Doughty played a major role in the Kings' Stanley Cup triumphs in 2012 and 2014, and he also has two Olympic gold medals from playing for Canada.
"Drew Doughty is one of the best defensemen in the world, and we are obviously excited to have reached this point in the process in which he has committed to the Kings long-term," Kings general manager Rob Blake said.
He still has one year left on an eight-year, $56 million contract signed in September 2011. Doughty can't formally sign the new deal until July 1, when he will be one year away from free agency.
By the time his new deal ends, Doughty will be 37 years old. Neither the Kings nor Doughty seriously expected the defenseman to leave his adopted home in free agency next year. He grew up a Kings fan in southern Ontario, and he was thrilled when Los Angeles chose him with the second overall pick in 2008.
Doughty is second among Kings defensemen in career goals (102), assists (320) and points (422), trailing only Blake in every category. He also has appeared in 84 playoff games, scoring 51 points.
The 28-year-old Doughty's new contract has the NHL's highest average annual value among defensemen, although it could be surpassed by the next contract for Ottawa's Erik Karlsson, whose current contract expires in 2019.
Los Angeles' elite veterans are all signed to long-term contracts through at least the next three seasons. Those players include captain Anze Kopitar, goalie Jonathan Quick, Dustin Brown, Jeff Carter, Alec Martinez, Dion Phaneuf and newcomer Ilya Kovalchuk, who signed with the Kings earlier this week.