In my situation as a 2nd level manager (Individual Contributor), I took the volunteer offer and retired in 2018 after a 35 Year Career. Lived off the severance package and commenced my pension a year later (took the annuity option for a steady stream of income). I have yet to commence social security (Waiting for Full SS Age Eligibility).
Rolled my 401K to Fidelity IRA and had some money in my old 401K that qualified for rolling over to a ROTH IRA.
At that time my overall net worth was about $1.7M in 2018 and has now risen to $2.4M in 6-years, thanks to investments in my IRAs.
The key to my accomplishment was to have paid off my mortgage about 15 years prior to retirement and what I saved in Mortgage payments, I contributed that money to my 401K. In the end I was contributing about 25% of my salary to 401K. The Market has been good my nest egg.
Living off of Pension and Cash Savings (CD's), not too difficult if you live within your means.
Also had subsidized Retiree Health Benefits, which may no longer be available to those still working for AT&T. Now on Medicare, and Monthly Medical Expense will have increased to some degree.
Point is Medical Expense and Mortgage are big part of your retirement expense needs.
What you need to retire on varies by individual, and you may or may not need 2 million to retire.
Be knowledgeable about Required Minimum Distributions (RMD's) that will commence at age 73 or 75 on your future IRA Accounts (NOT ROTH IRAs) and impacts on your Tax liability and Medicare Premiums. If I had to do it all over again, I would have made AFTER TAX contributions to the Company 401K.
Good Luck to whatever you are planning.