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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) (USD $)
In Millions
Sep. 30, 2011
Mar. 31, 2011
Financial Instruments [Line Items]  
Short-term investments, Fair Value$ 355$ 497[1]
Short-Term Investments [Member]
  
Financial Instruments [Line Items]  
Due in 1 year or less, Amortized Cost128214
Due in 1-2 years, Amortized Cost143156
Due in 2-3 years, Amortized Cost83126
Due in 1 year or less, Fair Value128214
Due in 1-2 years, Fair Value144157
Due in 2-3 years, Fair Value83126
Short-term investments, Amortized Cost354496
Short-term investments, Fair Value$ 355$ 497
[1]Derived from audited consolidated financial statements.