More than a decade ago, Walmart brought on a new CEO.

His name was Doug McMillan, and he had his work cut out for him.

At the time, Walmart's reputation was in the gutter.

Online shopping and Amazon were on the rise.

And other retailers like Costco and discount grocers were stealing market share.

Walmart's future wasn't totally clear.

Fast forward to today, and Walmart is doing much better.

And McMillan set the company on a course to hit a trillion-dollar market cap,

which it did just a few days ago.

Last month, after 12 years as CEO, and more than three decades at the company,

Doug McMillan retired.

Our colleague Sarah Nassauer interviewed him before his last day.

35 years, how do you feel? Emotional, excited, you know, first and foremost.

I think the company's in great hands.

I don't know what I'm going to do next other than help with Walmart for a while, but we'll figure that out.

Sarah, you spoke to Doug about his tenure at Walmart.

What stood out to you about the conversation?

I mean, for me, I've covered Walmart for 10 years, and I felt like he was a little bit more relaxed

than he's ever been when I'm talking to him. I guess, you know, we've known each other for a while,

but also he probably is on his way out the door and in a little bit of a different headspace

than he has been the last 12 years.

So what would you say, like, what defined his tenure?

...