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v3.20.1

Segment Information (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Revenue, Major Customer and Geographic Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries | $ 1,387 | $ 1,593 | $ 1,348 | $ 1,209 | $ 1,238 | $ 1,289 | $ 1,286 | $ 1,137 | $ 5,537 | $ 4,950 | $ 5,150
Entity Wide Revenue By Major Customer Percent Of Revenue Did Not Exceed Ten Percent |  |  |  |  |  |  |  |  | 10.00% |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Sony [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Geographic Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue By Major Customer Percent Of Revenue |  |  |  |  |  |  |  |  | 32.00% | 29.00% | 27.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Microsoft [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Geographic Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue By Major Customer Percent Of Revenue |  |  |  |  |  |  |  |  | 17.00% | 16.00% | 16.00%
Switzerland [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Geographic Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries |  |  |  |  |  |  |  |  | $ 2,586 | $ 2,303 | $ 2,272
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage |  |  |  |  |  |  |  |  | 47.00% | 47.00% | 44.00%
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer and Geographic Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile |  |  |  |  |  |  |  |  | 99.00% |  |

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