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Financial Instruments (Fair Value Of Short-Term Investments By Stated Maturity Date Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Mar. 31, 2015
Financial Instruments    
Short-term investments, Fair Value $ 966 $ 953 [1]
Short-Term Investments    
Financial Instruments    
Short-term investments, Amortized Cost 968 952
Short-term investments, Fair Value 966 953
Due in 1 year or less [Member] | Short-Term Investments    
Financial Instruments    
Due in 1 year or less, Amortized Cost 441 417
Due in 1 year or less, Fair Value 441 417
Due in 1-2 years [Member]    
Financial Instruments    
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 306 281
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 305 281
Due in 2-3 years [Member] | Short-Term Investments    
Financial Instruments    
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 221 244
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 220 245
Due in 3-4 years [Member] | Short-Term Investments    
Financial Instruments    
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 0 10
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value $ 0 $ 10
[1] Derived from audited Consolidated Financial Statements.