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Fair Value Measurements 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Carrying Value [Member]
   
Liabilities:    
Total debt $ 1,290 [1] $ 1,301 [1]
Facilities abandonment reserve 23 [2] 42 [2]
Estimated Fair Value [Member]
   
Liabilities:    
Total debt 1,413 [1] 1,408 [1]
Facilities abandonment reserve $ 27 [2] $ 48 [2]
[1] Estimated fair value of total debt is based on quoted prices for similar liabilities for which significant inputs are observable except for certain long-term lease obligations, for which fair value approximates carrying value (Level 2).
[2] Estimated fair value for the facilities abandonment reserve is determined using the Company’s incremental borrowing rate at March 31, 2013 and 2012. At March 31, 2013 and 2012, the facilities abandonment reserve included approximately $6 million and $16 million, respectively, in “Accrued expenses and other current liabilities” and approximately $17 million and $26 million, respectively, in “Other noncurrent liabilities” in the Company’s Consolidated Balance Sheets (Level 3).