[["in millions", "2007", "2008", "2009", "2010", "2011", "thereafter"], ["total debt ( a )", "$ 692", "$ 129", "$ 1143", "$ 1198", "$ 381", "$ 3680"], ["lease obligations ( b )", "144", "117", "94", "74", "60", "110"], ["purchase obligations ( cd )", "2329", "462", "362", "352", "323", "1794"], ["total", "$ 3165", "$ 708", "$ 1599", "$ 1624", "$ 764", "$ 5584"]]