Definition:Business segment
| Business segment | |
|---|---|
| Category | concepts; taxonomy |
| Aliases | Business segments |
| Related terms | Business unit, Business line, Property & casualty, Life & health |
| Definition | A major division of the insurance business by nature of risk and accounting treatment (Property & casualty, Life & health). |
🧱 Business segment is a major division of an insurance business by the nature of its risk and its accounting treatment: property & casualty on one side, life & health on the other, with asset management or banking standing beside them where a group runs such operations. The split is analytical rather than organizational. It groups contracts that behave alike, annually repriced damage cover versus long-duration person-linked cover, whichever unit happens to write them.
⚖️ The segment axis owes its power to accounting and capital treatment. Measurement, reserving, and disclosure differ fundamentally between short-duration property-casualty contracts and long-duration life business, so results only make sense sorted along this line: combined ratios and catastrophe commentary belong to one segment, investment margins and contractual-service-margin release to the other. Insurers' accounts therefore present revenue and result by segment, and analysts model each segment with different tools. A business segment cuts across business units: at AXA, most market units write both property & casualty and life & health, and the segment totals reassemble those books group-wide.
📊 Reading insurers well requires keeping this axis separate from the organizational one. A business unit says where and by whom business is run; a business segment says what kind of risk it is. Peer comparison runs on segments, since AXA's property-casualty book compares with Allianz's or Zurich's regardless of how each group organizes itself internally. When a document says a segment grew, the essential follow-up is which axis the figure sits on, because unit and segment tables slice the same premiums two different ways.