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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Assets    
Other long-term assets-related parties $ 10 $ 12
Long-term receivables from related parties, fair value 10 12
Liabilities    
Total debt - third parties (excluding short term borrowings), carrying value 4,432 4,451
Total debt - third parties (excluding short term borrowings), fair value $ 4,726 $ 4,734