Vantaggi
McKesson provides a lot of opportunity to grow, especially early on in your career, if you learn how to navigate the company and network. Benefits are pretty good (discounted stock purchases, 401k, bonuses for mid-level and up employees). Broadly, there is a culture of being flexible with your work hours to accommodate different lifestyles (school drop off, leaving early for dr appt, etc.). There is a variety of roles and an emphasis on trying new things/experiencing different kinds of businesses McKesson owns so you don't have just 'one' way to move up. PTO is generous and you are generally encouraged to take it.
Svantaggi
There are almost annual layoffs across different groups - no one is 'safe'. In my time with the company, multiple shared service groups have been outsourced or laid off, the technology group laid off 500 people last year and several months ago 800 people were laid off from within a business McKesson owns. Salaries are consistently lower and with less raises than similar roles in other companies. The culture can be really good, but McKesson is so big that it can vary greatly between organizations. If you end up in a good team, your work/life balance can be great. If you end up with a bad manager, you could burn out and get no help in growing your career/building your brand in a positive way. Regardless of teams, there are inevitably politics to navigate, though it's not always inhibitive. There can also be a huge variation in how much you are expected to come into the office - some teams are totally virtual, others are back in the office full time.
