By Patricia Sellers
February 6, 2014

FORTUNE — Job-hopping can be a path to promotions and big pay for many executives, but the global edition of the Fortune Most Powerful Women list, released today, suggests that there is still value in corporate loyalty. Ten of the 50 executives on the list have been working at their companies their entire career.

And the woman at the top—Mary Barra, the No. 1 Most Powerful Woman in Business globally – is a star who not only worked her way up to CEO at General Motors

over 33 years; she did it by not leaning in aggressively. No offense to Sheryl Sandberg (the Facebook

COO with the bestselling Lean In is No. 11 in our global rankings), but I asked Barra, for a Q&A that appears in the new issue of Fortune, if she has ever asked for a promotion. “No, I have not,” she replied. Have you ever asked for a raise? “No, I have not,” the new GM chief answered matter-of-factly.

Leaning back has not seemed to hurt Barra, 52. Her philosophy: “Do every job you’re in like you’re going to do it for the rest of your life and demonstrate that ownership of it,” she told me. “You deliver and produce results and you do it with high integrity and teamwork, and it’ll all work out. You don’t have to ask for different jobs, and you don’t have to ask for raises..”

That may sound Pollyannish, but more power to Barra if it works out for her longterm. If you’ve heard the report that she’s getting paid less than half of what her CEO predecessor, Dan Akerson, earned, don’t believe it. GM has disclosed only Barra’s base salary and short-term compensation so far. The company is yet to announce her long-term package, and until that happens in April, no one knows how her pay will compare. (On AC360 with Anderson Cooper Tuesday night, I suggested that the more fuss people make about Barra’s pay, the more likely she’ll earn more than Akerson.)

Another MPW lifer is making a big job change: Google

announced Wednesday that Susan Wojcicki, SVP of ads and commerce, is the new CEO of the company’s YouTube unit. Wojcicki, who famously rented her garage to co-founders Sergey Brin and Larry Page when they were plotting their startup and got onboard as employee No. 16, has been a team player much like Barra. It’s not in Wojcicki’s nature to push her own agenda over the company’s to advance her career. Now, after she has built and managed Google’s ad products these past 15 years, Wojcicki’s new assignment can fulfill her desire to run a business.

Wojcicki’s appointment makes sense for YouTube as well. My Fortune colleague Miguel Helft, who wrote a terrific cover story called “Why YouTube Changes Everything” last July, notes that YouTube’s No. 1 issue is not content or audience; rather, it’s ad rates. So the woman who has been, by some measures, the most powerful woman in advertising will work to make YouTube more than just a cultural phenom: a reliable money machine.

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