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Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Mar. 31, 2016
Finite-Lived Intangible Assets    
Gross carrying amount $ 608 $ 608
Accumulated amortization (599) (551)
Acquisition-related intangibles, net 9 57 [1]
Developed And Core Technology    
Finite-Lived Intangible Assets    
Gross carrying amount 412 412
Accumulated amortization (412) (368)
Acquisition-related intangibles, net 0 44
Trade Names And Trademarks    
Finite-Lived Intangible Assets    
Gross carrying amount 106 106
Accumulated amortization (97) (93)
Acquisition-related intangibles, net 9 13
Registered User Base And Other Intangibles    
Finite-Lived Intangible Assets    
Gross carrying amount 5 5
Accumulated amortization (5) (5)
Acquisition-related intangibles, net 0 0
Carrier Contracts And Related    
Finite-Lived Intangible Assets    
Gross carrying amount 85 85
Accumulated amortization (85) (85)
Acquisition-related intangibles, net $ 0 $ 0
[1] Derived from audited Consolidated Financial Statements.