Step 1: Take any PTO that exceeds 40 hours.
Step 2: Cash out any balance on your Bravo account
Step 3: Give Bravos to your peers, so they remember you fondly. Don't give so many that your boss becomes suspicious.
Step 4: "Export" copies of work that you are proud of, so you can show it to your next employer. Make sure to get rid on any member info.
Step 5: Consider giving very short notice: The only risk is that you won't be eligible for rehire by any UHC subsidiaries. While the company is large, it is a big world. A world far larger than UHC. In my experience people who give notice are treated like dirt during their notice period by their supervisors. If you feel you have special knowledge that your peers will need, email it to them right before you enter your resignation in the system.
Step 6: Did I forget anything?
If you are a virtual worker, they will send you boxes to return their equipment. If a piece of equipment is not a on the list to put in the box, it is yours to keep.