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Fair Value Measurements 3 (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Fair value measurements    
Facility exit reserves $ 70 $ 7
Facility Exit    
Fair value measurements    
Facility exit reserves 38 7
Facility Exit | Accrued Expenses and Other Current Liabilities    
Fair value measurements    
Facility exit reserves 12 2
Facility Exit | Other Noncurrent Liabilities    
Fair value measurements    
Facility exit reserves $ 26 $ 5