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Debt 1 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Debt obligations    
Other indebtedness, primarily capital leases $ 26 $ 29
Unamortized discount for Notes (5) (5)
Total debt outstanding 1,290 1,301
Less the current portion (16) (14)
Total long-term debt portion 1,274 1,287
Revolving Credit Facility Due August 2016 [Member]
   
Debt obligations    
Long-term debt, gross 0 0
5.375% Notes Due November 2019 [Member]
   
Debt obligations    
Long-term debt, gross 750 750
6.125% Notes Due December 2014 [Member]
   
Debt obligations    
6.125% Notes due December 2014, net of unamortized premium from fair value hedge of $19 and $27 $ 519 $ 527