I've seen the daily, monthly, quarterly and annual reports that my company gets from our TA (we also use Concur). The detail in the daily report is extensive. Specific to each individual person - routing, dates, airline, fare, ticket numbers, lower cost airline & fare, justification for lowest fare not chosen and whatever custom fields have been requested.

Monthly/quarterly/annual are summarized spends by airline, savings lost by not choosing lowest fare, and yes, kickbacks.

Wouldn't want to see any of my personal travel show up in that ...