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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Mar. 31, 2012
Financial Instruments    
Short-term investments, Fair Value $ 351 $ 437 [1]
Short-Term Investments
   
Financial Instruments    
Due in 1 year or less, Amortized Cost 132 207
Due in 1-2 years, Amortized Cost 112 123
Due in 2-3 years, Amortized Cost 106 106
Due in 1 year or less, Fair Value 132 207
Due in 1-2 years, Fair Value 112 124
Due in 2-3 years, Fair Value 107 106
Short-term investments, Amortized Cost 350 436
Short-term investments, Fair Value $ 351 $ 437
[1] Derived from audited consolidated financial statements.