The IOC put the rubber stamp on a pre-determined conclusion Wednesday, giving Paris the 2024 Games and LA the 2028 Games in a history-making vote.
Only two candidates checked all the boxes - Paris and Los Angeles, each with a storied tradition of Olympic hosting and an apparent understanding of Bach's much-touted reform package, known as Agenda 2020.
The IOC decided in July to award both Games at the same time, following the withdrawal of four of the six cities bidding for the 2024 Olympics, amid concerns about the size, cost and complexity of organising the world's biggest multi-sports event.
The 2024 edition will also be the third time that Paris hosts the games. "The Commission equally concludes that the many opportunities presented by an Olympic Games 2028 in Los Angeles would far outweigh any potential risks of awarding the Games 11 years in advance instead of 7 years".
It is the first time the International Olympic Committee has awarded a Games 11 years in advance.
President Thomas Bach said the votes for both cities were unanimous.
The entire French diplomatic network made the 2024 Paris bid a part of its dialogue with France's foreign partners and contributed to its promotion, while observing the rules of the IOC Code of Ethics.
The two bids had presentations at an IOC Session in Lima, Peru, before the cities were confirmed as hosts.
The pre-ordained outcome did little to dampen celebrations inside the Lima Convention Centre, where Paris and Los Angeles officials cheered and congratulated each other. "We have the two best possible games for the Olympics in 2024 and 2028, in two great Olympic countries".
"I think it's a very positive message about the value of the Olympic movement and the value of the Olympic Games", said Sergei Bubka, the Olympic champion pole vaulter, who is an honorary member of the IOC.
International Olympic Committee chief Bach first signalled publicly that the double-award of an Olympics could be on the agenda in December previous year, lamenting that the bidding process produced "too many losers". A new IOC evaluation committee report nodded off the switch as LA now became the first city to have 11 years to prepare for the Games.
The smooth finish to the race also eliminates the risk of the vote being tainted by the sort of scandal that has embroiled the ballot for the 2016 Olympics. Those with long memories recall free-flowing highways the last time the Olympics came to town, as locals either left the city or heeded warnings to use public transportation or stay home.