Warren Buffett Intrinsic Value Calculation

How do we determine the intrinsic value of a company?

"Intrinsic value can be defined simply: It is the discounted value of the cash that can be taken out of a business during its remaining life." - Warren Buffett

"As our definition suggests, intrinsic value is an estimate rather than a precise figure, and it is additionally an estimate that must be changed if interest rates move or forecasts of future cash flows are revised. Two people looking at the same set of facts, will almost inevitably come up with at least slightly different intrinsic value figures." - Warren Buffett