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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Financial Instruments [Line Items]    
Short-term investments, Fair Value $ 406 $ 497 [1]
Short-Term Investments [Member]
   
Financial Instruments [Line Items]    
Due in 1 year or less, Amortized Cost 187 214
Due in 1-2 years, Amortized Cost 118 156
Due in 2-3 years, Amortized Cost 100 126
Due in 1 year or less, Fair Value 187 214
Due in 1-2 years, Fair Value 118 157
Due in 2-3 years, Fair Value 101 126
Short-term investments, Amortized Cost 405 496
Short-term investments, Fair Value $ 406 $ 497
[1] Derived from audited consolidated financial statements.