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Fair Value Measurements (Financial Instruments Not Recorded at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Assets    
Long-term receivables from related parties, carrying value $ 15us-gaap_DueFromRelatedPartiesNoncurrent $ 12us-gaap_DueFromRelatedPartiesNoncurrent
Long-term receivables from related parties, fair value 15us-gaap_AccountsReceivableFairValueDisclosure 12us-gaap_AccountsReceivableFairValueDisclosure
Liabilities    
Total debt - third parties (excluding short term borrowings), carrying value 4,457us-gaap_LongTermDebt 4,451us-gaap_LongTermDebt
Total debt - third parties (excluding short term borrowings), fair value $ 4,659us-gaap_DebtInstrumentFairValue $ 4,734us-gaap_DebtInstrumentFairValue