Macquarie Group has given investors a detailed rundown of the loan portfolio in its corporate and asset finance division, which has been the subject of criticism recently.According to some negative commentary, Macquarie is speculating in the junk bond market and exploiting the government guarantee on its deposits to gain a competitive advantage over its investment banking rivals when it bids for assets.Macquarie's 2015/16 financial report reveals that the loan portfolio in question has a balance of A$9.5 billion. Ninety per cent of the portfolio is sub-investment grade but 97 per cent of the loans are secured and 81 per cent are senior debt.The assets are a mix of loans originated by Macquarie and secondary market investments. The secondary market assets are acquired with the intention of holding to maturity.About 85 per cent of realisations since inception are from repayments.Macquarie chief financial officer Patrick Upfold said each asset was acquired after intensive analysis, "name by name". Upfold said the portfolio was stress tested and subject to concentration analysis.The biggest sector exposure is corporate real estate, which makes up 26 per cent of the portfolio, followed by infrastructure (24 per cent) health and education (16 per cent), mortgage (11 per cent) and aerospace and airports (seven per cent).Average realised annual losses since inception are equivalent to 20 basis points of loan assets, Upfold said.CAF's loan impairments for the year to March were $167 million, compared with $153 million in the previous corresponding period.Corporate and asset finance contributed $1.1 billion to Macquarie Group profit of $2.1 billion for the year to March. CAF profit was up two per cent, compared with the previous year, and group profit was up 29 per cent.Macquarie's "annuity style" businesses - corporate and asset finance, Macquarie Asset Management, and the banking and financial services division - contributed 70 per cent of Macquarie's earnings.The CAF division is set for further growth following the acquisition in March of an aircraft leasing business AWAS Aviation Capital and the acquisition of the Esanda dealer auto finance portfolio from ANZ last year.Macquarie is now a top-three provider of finance to Australian car dealers.