CPU Metrics in ASH and AWR report

 In running an ASH and AWR reports, we are trying to determine the percentage of CPU a given service is consuming on our server.  For example, if for a 1 hour period, our OS reports state the database server was 60% CPU, and we have 3 Oracle services running within the database we want to find the metric in either AWR or ASH which would state

Service X - 40% CPU usage in Database

Service Y - 50% CPU usage in Database

Service Z - 10% CPU usage in Database

Therefore we can say Service X = (0.6 OS CPU used) * (0.4 CPU use in DB) = .24 = 24% of OS CPU was consumed by service X.  AWR provides service stats such as "DB CPU(s)" - Is this the number of seconds of CPU used?  If we had stats for "DB CPU(s)" as