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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Financial Instruments    
Short-term investments, Fair Value $ 355 $ 388 [1]
Short-Term Investments
   
Financial Instruments    
Due in 1 year or less, Amortized Cost 147 160
Due in 1-2 years, Amortized Cost 96 126
Due in 2-3 years, Amortized Cost 113 101
Short-term investments, Amortized Cost 356 387
Due in 1 year or less, Fair Value 146 160
Due in 1-2 years, Fair Value 96 127
Due in 2-3 years, Fair Value 113 101
Short-term investments, Fair Value $ 355 $ 388
[1] Derived from audited consolidated financial statements.