Key Takeaways BRK.B's service sub-segment drives 13-15% of revenues and about 48% of segment earnings.Service units like NetJets and TTI offer stable cash flow via recurring demand and long-term contracts.Scale, reinvestment and decentralized management make BRK.B's service arm a long-term growth engine.Berkshire Hathaway’s (BRK.B) Service and Retailing operations are a vital pillar of its long-term growth strategy, contributing significantly to revenues, earnings stability and diversification. Spanning se ...