Goodwill And Acquisition-Related Intangibles (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Goodwill [Roll Forward] | ||
| Goodwill, Gross, Beginning balance | $ 2,078 | $ 2,081 |
| Accumulated impairment, beginning balance | (368) | (368) |
| Goodwill, Net, Beginning balance | 1,710 | 1,713 |
| Effects of foreign currency translation | (3) | (3) |
| Goodwill, Gross, Ending balance | 2,075 | 2,078 |
| Accumulated impairment, ending balance | (368) | (368) |
| Goodwill, Net, Ending balance | $ 1,707 | $ 1,710 |
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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