I know some people who were part of the Dow and Dupont merger some years ago and got spun off into one of the "new" companies. At the time of the merger, Dupont had partially grandfathered long time employees into a hybrid pension and 401k program. Pension contributions were much smaller but supposedly you made up for it with more 401k. Dupont then completely stopped adding new contributions and made it all 401k match. Meanwhile, Dow had grandfathered in long time employees with the same pension program but new hires starting about 15 years ago were all 401k match.
After the merged company was broken up into three new companies, two of the three did not offer any pensions at all while "new Dow" kept the pension program for a few years. Then they stopped new contributions and only enhanced 401k.
One guy I know was a Dow employee transferred to Corteva (a spin off) in his early 50s. He kept his Dow pension that he had already earned but nothing going forward. Like 3M, the pension contributions in your 50s can be very nice (the multipliers are better than in your 30s and 40s). He decided that he had to work two more years than planned because, unless he could outperform the financial professionals managing Dows pension, he would come up way short.
Another guy stayed with Dow in his mid 40s but the pension changeover to 401k match only will cost him 200k in the long run. They gave you software to compare old vs new expected earnings in your pension and 401k. Bottom line is the companies saved money at the employees expense.
As for 3M, they know what Dow and Dupont did and how it saved money and will do the same here.
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HC spin will get no pension adds. What you carried in is what you have. 401k match only.
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Remain Co will likely keep the 3M pension for a few more years until Vale breaks 3M into more pieces and then any new adds to pensions stop.
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Unless you had an ironclad union contract on retiree medical, 3M can change (reduce, eliminate) anytime. Some people in their late 50s or early 60s may be forced to work somewhere else post 3M to have medical insurance until Medicare at 65.
All of this sucks, but I have to wonder if an activist had taken on 3M years ago and forced out people like Inge and Mike, maybe they would have found better leaders who would have grown the pieces left of this company better. Life would still have been a bumpy ride for employees but at least the businesses would be doing well.