After forward Eugenie Le Sommer had fired in the first goal of the tournament in the ninth minute, centre-back Renard converted one header in the 35th and then another in first-half stoppage-time.
Captain Amandine Henry, impressive throughout, wrapped up the win late on in the Group A encounter, watched by French President Emmanuel Macron and Federation Internationale de Football Association chief Gianni Infantino.
"The first match, the result is not that good", he said through a translator.
"That is what he said and that is what I am paid to do".
France head coach Corinne Diacre took a measured response after the victory, noting her squad still has a long way to go to claim the title and in the meantime must keep themselves grounded. We have six more steps on the road that need to be taken.
And while the circumstances of playing in front of the home fans in a World Cup opener could have proved overwhelming, Renard was pleased with how her team-mates responded to the occasion. "We went into the match the right way". Heading into the tournament the United States are considered the favorites.
This time, contenders to lift the trophy in Lyon on July 7 are plentiful.
"This country will enter World Cup fever when it kicks off".
"Nowadays, there are eight or nine teams who can be world champions".
'We'll have 30 or 40,000 people pushing us to win games'.
Later on Saturday, in the same group, Spain take on South Africa in the northern port of Le Havre at 1600 GMT, with the Banyana Banyana hoping to make a big impression in their first World Cup appearance.
Les Bleues have crashed out in the quarter-finals of their last four major tournaments: two European Championships, the Rio Olympics and defeat on penalties against Germany at the 2015 World Cup, earning them a the unwanted tag of "chokers" ahead of hosting this year.
In reply, South Korea also tried to level up the game with an opener before half-hour mark but Ji So-Yun failed to hit the ball from the box.