https://www.thelayoff.com/t/190zMYM7
From the chatter (not sure how true the information is) from Shell board, the following is the severence from peers:
Shell USA SVS will pay three weeks per year served (78 weeks max).
BP paid 1 month for every year of service and 1.5 months per year if you had joined before 2009.
Chevron gave the same 3 weeks/service year, but they also cover health insurance for a full year.
Oxy gave Anadarco folks 1 year regardless of years of service. I believe Pioneer did 1.5 years regardless of years of service.