. rental expense for operating leases , excluding amounts related to the sale/leaseback discussed below , was $ 31 million $ 32 million and $ 13 million in the years ended december 31 , 2002 , 2001and 2000 , respectively , including commitments of businesses classified as discontinued amounting to $ 6 million in 2002 , $ 16 million in 2001 and $ 6 million in 2000 . the future minimum lease commitments under these leases are as follows ( in millions ) : discontinued total operations .