Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Amortization Of Intangible Assets) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization of intangibles | $ 1 | $ 3 | $ 3 | $ 4 |
| Cost of service and other | ||||
| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization of intangibles | 8 | 8 | 16 | 16 |
| Cost of product | ||||
| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization of intangibles | 4 | 3 | 9 | 7 |
| Operating expenses | ||||
| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization of intangibles | 1 | 3 | 3 | 4 |
| Total amortization | ||||
| Finite-Lived Intangible Assets [Line Items] | ||||
| Amortization of intangibles | $ 13 | $ 14 | $ 28 | $ 27 |